diff --git a/pkg/api/api.go b/pkg/api/api.go
index 510a1391e..08f6433d8 100644
--- a/pkg/api/api.go
+++ b/pkg/api/api.go
@@ -32,9 +32,9 @@ type Service interface {
 	// Push executes the equivalent ot a `compose push`
 	Push(ctx context.Context, project *types.Project, options PushOptions) error
 	// Pull executes the equivalent of a `compose pull`
-	Pull(ctx context.Context, project *types.Project, opts PullOptions) error
+	Pull(ctx context.Context, project *types.Project, options PullOptions) error
 	// Create executes the equivalent to a `compose create`
-	Create(ctx context.Context, project *types.Project, opts CreateOptions) error
+	Create(ctx context.Context, project *types.Project, options CreateOptions) error
 	// Start executes the equivalent to a `compose start`
 	Start(ctx context.Context, projectName string, options StartOptions) error
 	// Restart restarts containers
@@ -54,25 +54,25 @@ type Service interface {
 	// Convert translate compose model into backend's native format
 	Convert(ctx context.Context, project *types.Project, options ConvertOptions) ([]byte, error)
 	// Kill executes the equivalent to a `compose kill`
-	Kill(ctx context.Context, project string, options KillOptions) error
+	Kill(ctx context.Context, projectName string, options KillOptions) error
 	// RunOneOffContainer creates a service oneoff container and starts its dependencies
 	RunOneOffContainer(ctx context.Context, project *types.Project, opts RunOptions) (int, error)
 	// Remove executes the equivalent to a `compose rm`
-	Remove(ctx context.Context, project string, options RemoveOptions) error
+	Remove(ctx context.Context, projectName string, options RemoveOptions) error
 	// Exec executes a command in a running service container
-	Exec(ctx context.Context, project string, opts RunOptions) (int, error)
+	Exec(ctx context.Context, projectName string, options RunOptions) (int, error)
 	// Copy copies a file/folder between a service container and the local filesystem
-	Copy(ctx context.Context, project string, options CopyOptions) error
+	Copy(ctx context.Context, projectName string, options CopyOptions) error
 	// Pause executes the equivalent to a `compose pause`
-	Pause(ctx context.Context, project string, options PauseOptions) error
+	Pause(ctx context.Context, projectName string, options PauseOptions) error
 	// UnPause executes the equivalent to a `compose unpause`
-	UnPause(ctx context.Context, project string, options PauseOptions) error
+	UnPause(ctx context.Context, projectName string, options PauseOptions) error
 	// Top executes the equivalent to a `compose top`
 	Top(ctx context.Context, projectName string, services []string) ([]ContainerProcSummary, error)
 	// Events executes the equivalent to a `compose events`
-	Events(ctx context.Context, project string, options EventsOptions) error
+	Events(ctx context.Context, projectName string, options EventsOptions) error
 	// Port executes the equivalent to a `compose port`
-	Port(ctx context.Context, project string, service string, port int, options PortOptions) (string, int, error)
+	Port(ctx context.Context, projectName string, service string, port int, options PortOptions) (string, int, error)
 	// Images executes the equivalent of a `compose images`
 	Images(ctx context.Context, projectName string, options ImagesOptions) ([]ImageSummary, error)
 }
diff --git a/pkg/api/proxy.go b/pkg/api/proxy.go
index 44adf646e..5dcfa0e7f 100644
--- a/pkg/api/proxy.go
+++ b/pkg/api/proxy.go
@@ -219,11 +219,11 @@ func (s *ServiceProxy) Convert(ctx context.Context, project *types.Project, opti
 }
 
 // Kill implements Service interface
-func (s *ServiceProxy) Kill(ctx context.Context, project string, options KillOptions) error {
+func (s *ServiceProxy) Kill(ctx context.Context, projectName string, options KillOptions) error {
 	if s.KillFn == nil {
 		return ErrNotImplemented
 	}
-	return s.KillFn(ctx, project, options)
+	return s.KillFn(ctx, projectName, options)
 }
 
 // RunOneOffContainer implements Service interface
@@ -238,43 +238,43 @@ func (s *ServiceProxy) RunOneOffContainer(ctx context.Context, project *types.Pr
 }
 
 // Remove implements Service interface
-func (s *ServiceProxy) Remove(ctx context.Context, project string, options RemoveOptions) error {
+func (s *ServiceProxy) Remove(ctx context.Context, projectName string, options RemoveOptions) error {
 	if s.RemoveFn == nil {
 		return ErrNotImplemented
 	}
-	return s.RemoveFn(ctx, project, options)
+	return s.RemoveFn(ctx, projectName, options)
 }
 
 // Exec implements Service interface
-func (s *ServiceProxy) Exec(ctx context.Context, project string, options RunOptions) (int, error) {
+func (s *ServiceProxy) Exec(ctx context.Context, projectName string, options RunOptions) (int, error) {
 	if s.ExecFn == nil {
 		return 0, ErrNotImplemented
 	}
-	return s.ExecFn(ctx, project, options)
+	return s.ExecFn(ctx, projectName, options)
 }
 
 // Copy implements Service interface
-func (s *ServiceProxy) Copy(ctx context.Context, project string, options CopyOptions) error {
+func (s *ServiceProxy) Copy(ctx context.Context, projectName string, options CopyOptions) error {
 	if s.CopyFn == nil {
 		return ErrNotImplemented
 	}
-	return s.CopyFn(ctx, project, options)
+	return s.CopyFn(ctx, projectName, options)
 }
 
 // Pause implements Service interface
-func (s *ServiceProxy) Pause(ctx context.Context, project string, options PauseOptions) error {
+func (s *ServiceProxy) Pause(ctx context.Context, projectName string, options PauseOptions) error {
 	if s.PauseFn == nil {
 		return ErrNotImplemented
 	}
-	return s.PauseFn(ctx, project, options)
+	return s.PauseFn(ctx, projectName, options)
 }
 
 // UnPause implements Service interface
-func (s *ServiceProxy) UnPause(ctx context.Context, project string, options PauseOptions) error {
+func (s *ServiceProxy) UnPause(ctx context.Context, projectName string, options PauseOptions) error {
 	if s.UnPauseFn == nil {
 		return ErrNotImplemented
 	}
-	return s.UnPauseFn(ctx, project, options)
+	return s.UnPauseFn(ctx, projectName, options)
 }
 
 // Top implements Service interface
@@ -286,19 +286,19 @@ func (s *ServiceProxy) Top(ctx context.Context, project string, services []strin
 }
 
 // Events implements Service interface
-func (s *ServiceProxy) Events(ctx context.Context, project string, options EventsOptions) error {
+func (s *ServiceProxy) Events(ctx context.Context, projectName string, options EventsOptions) error {
 	if s.EventsFn == nil {
 		return ErrNotImplemented
 	}
-	return s.EventsFn(ctx, project, options)
+	return s.EventsFn(ctx, projectName, options)
 }
 
 // Port implements Service interface
-func (s *ServiceProxy) Port(ctx context.Context, project string, service string, port int, options PortOptions) (string, int, error) {
+func (s *ServiceProxy) Port(ctx context.Context, projectName string, service string, port int, options PortOptions) (string, int, error) {
 	if s.PortFn == nil {
 		return "", 0, ErrNotImplemented
 	}
-	return s.PortFn(ctx, project, service, port, options)
+	return s.PortFn(ctx, projectName, service, port, options)
 }
 
 // Images implements Service interface
diff --git a/pkg/compose/cp.go b/pkg/compose/cp.go
index b2123e601..b43a98f8b 100644
--- a/pkg/compose/cp.go
+++ b/pkg/compose/cp.go
@@ -42,9 +42,10 @@ const (
 	acrossServices = fromService | toService
 )
 
-func (s *composeService) Copy(ctx context.Context, project string, opts api.CopyOptions) error {
-	srcService, srcPath := splitCpArg(opts.Source)
-	destService, dstPath := splitCpArg(opts.Destination)
+func (s *composeService) Copy(ctx context.Context, projectName string, options api.CopyOptions) error {
+	projectName = strings.ToLower(projectName)
+	srcService, srcPath := splitCpArg(options.Source)
+	destService, dstPath := splitCpArg(options.Destination)
 
 	var direction copyDirection
 	var serviceName string
@@ -53,7 +54,7 @@ func (s *composeService) Copy(ctx context.Context, project string, opts api.Copy
 		serviceName = srcService
 
 		// copying from multiple containers of a services doesn't make sense.
-		if opts.All {
+		if options.All {
 			return errors.New("cannot use the --all flag when copying from a service")
 		}
 	}
@@ -62,7 +63,7 @@ func (s *composeService) Copy(ctx context.Context, project string, opts api.Copy
 		serviceName = destService
 	}
 
-	containers, err := s.getContainers(ctx, project, oneOffExclude, true, serviceName)
+	containers, err := s.getContainers(ctx, projectName, oneOffExclude, true, serviceName)
 	if err != nil {
 		return err
 	}
@@ -71,8 +72,8 @@ func (s *composeService) Copy(ctx context.Context, project string, opts api.Copy
 		return fmt.Errorf("no container found for service %q", serviceName)
 	}
 
-	if !opts.All {
-		containers = containers.filter(indexed(opts.Index))
+	if !options.All {
+		containers = containers.filter(indexed(options.Index))
 	}
 
 	g := errgroup.Group{}
@@ -81,9 +82,9 @@ func (s *composeService) Copy(ctx context.Context, project string, opts api.Copy
 		g.Go(func() error {
 			switch direction {
 			case fromService:
-				return s.copyFromContainer(ctx, containerID, srcPath, dstPath, opts)
+				return s.copyFromContainer(ctx, containerID, srcPath, dstPath, options)
 			case toService:
-				return s.copyToContainer(ctx, containerID, srcPath, dstPath, opts)
+				return s.copyToContainer(ctx, containerID, srcPath, dstPath, options)
 			case acrossServices:
 				return errors.New("copying between services is not supported")
 			default:
diff --git a/pkg/compose/events.go b/pkg/compose/events.go
index 4d04aaa73..172e3eec2 100644
--- a/pkg/compose/events.go
+++ b/pkg/compose/events.go
@@ -29,9 +29,10 @@ import (
 	"github.com/docker/compose/v2/pkg/utils"
 )
 
-func (s *composeService) Events(ctx context.Context, project string, options api.EventsOptions) error {
+func (s *composeService) Events(ctx context.Context, projectName string, options api.EventsOptions) error {
+	projectName = strings.ToLower(projectName)
 	events, errors := s.apiClient().Events(ctx, moby.EventsOptions{
-		Filters: filters.NewArgs(projectFilter(project)),
+		Filters: filters.NewArgs(projectFilter(projectName)),
 	})
 	for {
 		select {
diff --git a/pkg/compose/exec.go b/pkg/compose/exec.go
index cbc6c0a11..aa1e5c58c 100644
--- a/pkg/compose/exec.go
+++ b/pkg/compose/exec.go
@@ -19,6 +19,7 @@ package compose
 import (
 	"context"
 	"fmt"
+	"strings"
 
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command/container"
@@ -27,22 +28,23 @@ import (
 	"github.com/docker/docker/api/types/filters"
 )
 
-func (s *composeService) Exec(ctx context.Context, project string, opts api.RunOptions) (int, error) {
-	target, err := s.getExecTarget(ctx, project, opts)
+func (s *composeService) Exec(ctx context.Context, projectName string, options api.RunOptions) (int, error) {
+	projectName = strings.ToLower(projectName)
+	target, err := s.getExecTarget(ctx, projectName, options)
 	if err != nil {
 		return 0, err
 	}
 
 	exec := container.NewExecOptions()
-	exec.Interactive = opts.Interactive
-	exec.TTY = opts.Tty
-	exec.Detach = opts.Detach
-	exec.User = opts.User
-	exec.Privileged = opts.Privileged
-	exec.Workdir = opts.WorkingDir
+	exec.Interactive = options.Interactive
+	exec.TTY = options.Tty
+	exec.Detach = options.Detach
+	exec.User = options.User
+	exec.Privileged = options.Privileged
+	exec.Workdir = options.WorkingDir
 	exec.Container = target.ID
-	exec.Command = opts.Command
-	for _, v := range opts.Environment {
+	exec.Command = options.Command
+	for _, v := range options.Environment {
 		err := exec.Env.Set(v)
 		if err != nil {
 			return 0, err
diff --git a/pkg/compose/images.go b/pkg/compose/images.go
index 787db8bcf..7c25b20de 100644
--- a/pkg/compose/images.go
+++ b/pkg/compose/images.go
@@ -32,6 +32,7 @@ import (
 )
 
 func (s *composeService) Images(ctx context.Context, projectName string, options api.ImagesOptions) ([]api.ImageSummary, error) {
+	projectName = strings.ToLower(projectName)
 	allContainers, err := s.apiClient().ContainerList(ctx, moby.ContainerListOptions{
 		All:     true,
 		Filters: filters.NewArgs(projectFilter(projectName)),
diff --git a/pkg/compose/kill.go b/pkg/compose/kill.go
index afba4f01d..aa057bc81 100644
--- a/pkg/compose/kill.go
+++ b/pkg/compose/kill.go
@@ -19,6 +19,7 @@ package compose
 import (
 	"context"
 	"fmt"
+	"strings"
 
 	moby "github.com/docker/docker/api/types"
 	"golang.org/x/sync/errgroup"
@@ -27,19 +28,19 @@ import (
 	"github.com/docker/compose/v2/pkg/progress"
 )
 
-func (s *composeService) Kill(ctx context.Context, project string, options api.KillOptions) error {
+func (s *composeService) Kill(ctx context.Context, projectName string, options api.KillOptions) error {
 	return progress.Run(ctx, func(ctx context.Context) error {
-		return s.kill(ctx, project, options)
+		return s.kill(ctx, strings.ToLower(projectName), options)
 	})
 }
 
-func (s *composeService) kill(ctx context.Context, project string, options api.KillOptions) error {
+func (s *composeService) kill(ctx context.Context, projectName string, options api.KillOptions) error {
 	w := progress.ContextWriter(ctx)
 
 	services := options.Services
 
 	var containers Containers
-	containers, err := s.getContainers(ctx, project, oneOffInclude, false, services...)
+	containers, err := s.getContainers(ctx, projectName, oneOffInclude, false, services...)
 	if err != nil {
 		return err
 	}
diff --git a/pkg/compose/logs.go b/pkg/compose/logs.go
index 8d58af91a..7f2520745 100644
--- a/pkg/compose/logs.go
+++ b/pkg/compose/logs.go
@@ -19,6 +19,7 @@ package compose
 import (
 	"context"
 	"io"
+	"strings"
 
 	"github.com/docker/compose/v2/pkg/api"
 	"github.com/docker/compose/v2/pkg/utils"
@@ -28,6 +29,7 @@ import (
 )
 
 func (s *composeService) Logs(ctx context.Context, projectName string, consumer api.LogConsumer, options api.LogOptions) error {
+	projectName = strings.ToLower(projectName)
 	containers, err := s.getContainers(ctx, projectName, oneOffExclude, true, options.Services...)
 	if err != nil {
 		return err
diff --git a/pkg/compose/pause.go b/pkg/compose/pause.go
index 1f91217ed..3ea593eef 100644
--- a/pkg/compose/pause.go
+++ b/pkg/compose/pause.go
@@ -18,6 +18,7 @@ package compose
 
 import (
 	"context"
+	"strings"
 
 	moby "github.com/docker/docker/api/types"
 	"golang.org/x/sync/errgroup"
@@ -26,9 +27,9 @@ import (
 	"github.com/docker/compose/v2/pkg/progress"
 )
 
-func (s *composeService) Pause(ctx context.Context, project string, options api.PauseOptions) error {
+func (s *composeService) Pause(ctx context.Context, projectName string, options api.PauseOptions) error {
 	return progress.Run(ctx, func(ctx context.Context) error {
-		return s.pause(ctx, project, options)
+		return s.pause(ctx, strings.ToLower(projectName), options)
 	})
 }
 
@@ -54,14 +55,14 @@ func (s *composeService) pause(ctx context.Context, project string, options api.
 	return eg.Wait()
 }
 
-func (s *composeService) UnPause(ctx context.Context, project string, options api.PauseOptions) error {
+func (s *composeService) UnPause(ctx context.Context, projectName string, options api.PauseOptions) error {
 	return progress.Run(ctx, func(ctx context.Context) error {
-		return s.unPause(ctx, project, options)
+		return s.unPause(ctx, strings.ToLower(projectName), options)
 	})
 }
 
-func (s *composeService) unPause(ctx context.Context, project string, options api.PauseOptions) error {
-	containers, err := s.getContainers(ctx, project, oneOffExclude, false, options.Services...)
+func (s *composeService) unPause(ctx context.Context, projectName string, options api.PauseOptions) error {
+	containers, err := s.getContainers(ctx, projectName, oneOffExclude, false, options.Services...)
 	if err != nil {
 		return err
 	}
diff --git a/pkg/compose/port.go b/pkg/compose/port.go
index d6035462c..c41781d04 100644
--- a/pkg/compose/port.go
+++ b/pkg/compose/port.go
@@ -19,6 +19,7 @@ package compose
 import (
 	"context"
 	"fmt"
+	"strings"
 
 	"github.com/docker/compose/v2/pkg/api"
 
@@ -26,10 +27,11 @@ import (
 	"github.com/docker/docker/api/types/filters"
 )
 
-func (s *composeService) Port(ctx context.Context, project string, service string, port int, options api.PortOptions) (string, int, error) {
+func (s *composeService) Port(ctx context.Context, projectName string, service string, port int, options api.PortOptions) (string, int, error) {
+	projectName = strings.ToLower(projectName)
 	list, err := s.apiClient().ContainerList(ctx, moby.ContainerListOptions{
 		Filters: filters.NewArgs(
-			projectFilter(project),
+			projectFilter(projectName),
 			serviceFilter(service),
 			containerNumberFilter(options.Index),
 		),
diff --git a/pkg/compose/ps.go b/pkg/compose/ps.go
index 7a4e0b7cc..de4b25f2e 100644
--- a/pkg/compose/ps.go
+++ b/pkg/compose/ps.go
@@ -19,6 +19,7 @@ package compose
 import (
 	"context"
 	"sort"
+	"strings"
 
 	"golang.org/x/sync/errgroup"
 
@@ -26,6 +27,7 @@ import (
 )
 
 func (s *composeService) Ps(ctx context.Context, projectName string, options api.PsOptions) ([]api.ContainerSummary, error) {
+	projectName = strings.ToLower(projectName)
 	oneOff := oneOffExclude
 	if options.All {
 		oneOff = oneOffInclude
diff --git a/pkg/compose/pull.go b/pkg/compose/pull.go
index 2e8b764e1..2bd25b290 100644
--- a/pkg/compose/pull.go
+++ b/pkg/compose/pull.go
@@ -36,12 +36,12 @@ import (
 	"github.com/docker/compose/v2/pkg/progress"
 )
 
-func (s *composeService) Pull(ctx context.Context, project *types.Project, opts api.PullOptions) error {
-	if opts.Quiet {
-		return s.pull(ctx, project, opts)
+func (s *composeService) Pull(ctx context.Context, project *types.Project, options api.PullOptions) error {
+	if options.Quiet {
+		return s.pull(ctx, project, options)
 	}
 	return progress.Run(ctx, func(ctx context.Context) error {
-		return s.pull(ctx, project, opts)
+		return s.pull(ctx, project, options)
 	})
 }
 
diff --git a/pkg/compose/remove.go b/pkg/compose/remove.go
index c5dd3dd84..cc10b71a9 100644
--- a/pkg/compose/remove.go
+++ b/pkg/compose/remove.go
@@ -30,6 +30,7 @@ import (
 )
 
 func (s *composeService) Remove(ctx context.Context, projectName string, options api.RemoveOptions) error {
+	projectName = strings.ToLower(projectName)
 	containers, _, err := s.actualState(ctx, projectName, options.Services)
 	if err != nil {
 		if api.IsNotFoundError(err) {
diff --git a/pkg/compose/restart.go b/pkg/compose/restart.go
index 34b9d6d33..4d4f0d4cc 100644
--- a/pkg/compose/restart.go
+++ b/pkg/compose/restart.go
@@ -18,6 +18,7 @@ package compose
 
 import (
 	"context"
+	"strings"
 
 	"github.com/docker/compose/v2/pkg/api"
 	"golang.org/x/sync/errgroup"
@@ -28,7 +29,7 @@ import (
 
 func (s *composeService) Restart(ctx context.Context, projectName string, options api.RestartOptions) error {
 	return progress.Run(ctx, func(ctx context.Context) error {
-		return s.restart(ctx, projectName, options)
+		return s.restart(ctx, strings.ToLower(projectName), options)
 	})
 }
 
diff --git a/pkg/compose/start.go b/pkg/compose/start.go
index 4b1e3ed2d..ff699ffb0 100644
--- a/pkg/compose/start.go
+++ b/pkg/compose/start.go
@@ -18,6 +18,7 @@ package compose
 
 import (
 	"context"
+	"strings"
 
 	"github.com/compose-spec/compose-go/types"
 	moby "github.com/docker/docker/api/types"
@@ -30,7 +31,7 @@ import (
 
 func (s *composeService) Start(ctx context.Context, projectName string, options api.StartOptions) error {
 	return progress.Run(ctx, func(ctx context.Context) error {
-		return s.start(ctx, projectName, options, nil)
+		return s.start(ctx, strings.ToLower(projectName), options, nil)
 	})
 }
 
diff --git a/pkg/compose/stop.go b/pkg/compose/stop.go
index 686b852d2..520d1fa41 100644
--- a/pkg/compose/stop.go
+++ b/pkg/compose/stop.go
@@ -18,6 +18,7 @@ package compose
 
 import (
 	"context"
+	"strings"
 
 	"github.com/docker/compose/v2/pkg/api"
 	"github.com/docker/compose/v2/pkg/progress"
@@ -25,7 +26,7 @@ import (
 
 func (s *composeService) Stop(ctx context.Context, projectName string, options api.StopOptions) error {
 	return progress.Run(ctx, func(ctx context.Context) error {
-		return s.stop(ctx, projectName, options)
+		return s.stop(ctx, strings.ToLower(projectName), options)
 	})
 }
 
diff --git a/pkg/compose/top.go b/pkg/compose/top.go
index a65b72874..1ac4cd4c4 100644
--- a/pkg/compose/top.go
+++ b/pkg/compose/top.go
@@ -18,12 +18,14 @@ package compose
 
 import (
 	"context"
+	"strings"
 
 	"github.com/docker/compose/v2/pkg/api"
 	"golang.org/x/sync/errgroup"
 )
 
 func (s *composeService) Top(ctx context.Context, projectName string, services []string) ([]api.ContainerProcSummary, error) {
+	projectName = strings.ToLower(projectName)
 	var containers Containers
 	containers, err := s.getContainers(ctx, projectName, oneOffInclude, false)
 	if err != nil {