diff --git a/library/Icinga/Application/Modules/Manager.php b/library/Icinga/Application/Modules/Manager.php
index ec2193af9..3d50df109 100644
--- a/library/Icinga/Application/Modules/Manager.php
+++ b/library/Icinga/Application/Modules/Manager.php
@@ -252,7 +252,7 @@ class Manager
     }
 
     /**
-     * Disable the given module and remove it's enabled state
+     * Disable the given module and remove its enabled state
      *
      * @param   string $name                The name of the module to disable
      *
diff --git a/library/Icinga/Chart/Axis.php b/library/Icinga/Chart/Axis.php
index 8a0ad5532..a7f8d6d5f 100644
--- a/library/Icinga/Chart/Axis.php
+++ b/library/Icinga/Chart/Axis.php
@@ -16,7 +16,7 @@ use Icinga\Chart\Unit\LinearUnit;
 /**
  * Axis class for the GridChart class.
  *
- * Implements drawing functions for the axis and it's labels but delegates tick and label calculations
+ * Implements drawing functions for the axis and its labels but delegates tick and label calculations
  * to the AxisUnit implementations
  *
  * @see GridChart
diff --git a/library/Icinga/Web/Controller/BasePreferenceController.php b/library/Icinga/Web/Controller/BasePreferenceController.php
index af8229262..84e2b045b 100644
--- a/library/Icinga/Web/Controller/BasePreferenceController.php
+++ b/library/Icinga/Web/Controller/BasePreferenceController.php
@@ -27,7 +27,7 @@ class BasePreferenceController extends ActionController
     }
 
     /**
-     *  Initialize the controller and collect all tabs for it from the application and it's modules
+     *  Initialize the controller and collect all tabs for it from the application and its modules
      *
      *  @see ActionController::init()
      */
diff --git a/library/Icinga/Web/Widget/AbstractWidget.php b/library/Icinga/Web/Widget/AbstractWidget.php
index a1c1a244e..e047d7512 100644
--- a/library/Icinga/Web/Widget/AbstractWidget.php
+++ b/library/Icinga/Web/Widget/AbstractWidget.php
@@ -26,7 +26,7 @@ abstract class AbstractWidget
 {
     /**
      * If you are going to access the current view with the view() function,
-     * it's instance is stored here for performance reasons.
+     * its instance is stored here for performance reasons.
      *
      * @var Zend_View_Abstract
      */
diff --git a/library/Icinga/Web/Widget/Dashboard.php b/library/Icinga/Web/Widget/Dashboard.php
index 00d39cd71..258c9cf2e 100644
--- a/library/Icinga/Web/Widget/Dashboard.php
+++ b/library/Icinga/Web/Widget/Dashboard.php
@@ -18,7 +18,7 @@ use Icinga\Web\Url;
  *
  * The terminology is as follows:
  * - Dashlet:     A single view showing a specific url
- * - Pane:          Aggregates one or more dashlets on one page, displays it's title as a tab
+ * - Pane:          Aggregates one or more dashlets on one page, displays its title as a tab
  * - Dashboard:     Shows all panes
  *
  */
@@ -347,7 +347,7 @@ class Dashboard extends AbstractWidget
     }
 
     /**
-     * Activates the default pane of this dashboard and returns it's name
+     * Activates the default pane of this dashboard and returns its name
      *
      * @return mixed
      */
diff --git a/library/Icinga/Web/Widget/Tabs.php b/library/Icinga/Web/Widget/Tabs.php
index e83d10783..4952d29b1 100644
--- a/library/Icinga/Web/Widget/Tabs.php
+++ b/library/Icinga/Web/Widget/Tabs.php
@@ -207,7 +207,7 @@ EOT;
      * with tab properties or an instance of an existing Tab
      *
      * @param   string      $name   The new tab name
-     * @param   array|Tab   $tab    The tab itself of it's properties
+     * @param   array|Tab   $tab    The tab itself of its properties
      *
      * @return  self
      *
@@ -232,7 +232,7 @@ EOT;
      * of an existing Tab
      *
      * @param   string      $name   The new tab name
-     * @param   array|Tab   $tab    The tab itself of it's properties
+     * @param   array|Tab   $tab    The tab itself of its properties
      *
      * @return  self
      */
@@ -279,7 +279,7 @@ EOT;
     }
 
     /**
-     * Render the dropdown area with it's tabs and return the resulting HTML
+     * Render the dropdown area with its tabs and return the resulting HTML
      *
      * @return  mixed|string
      */
diff --git a/modules/doc/module.info b/modules/doc/module.info
index 1689fd940..2c6f48ac9 100644
--- a/modules/doc/module.info
+++ b/modules/doc/module.info
@@ -1,4 +1,4 @@
 Module: doc
 Version: 2.0.0
 Description: Documentation module
- Extracts, shows and exports documentation for Icinga Web 2 and it's modules.
+ Extracts, shows and exports documentation for Icinga Web 2 and its modules.
diff --git a/modules/test/module.info b/modules/test/module.info
index 646315156..ed6adc1f2 100644
--- a/modules/test/module.info
+++ b/modules/test/module.info
@@ -2,4 +2,4 @@ Module: test
 Version: 2.0.0~alpha4
 Description: Translation module
  This module allows developers to run (unit) tests against Icinga Web 2 and
- any of it's modules. Usually you do not need to enable this.
+ any of its modules. Usually you do not need to enable this.
diff --git a/modules/translation/application/clicommands/CompileCommand.php b/modules/translation/application/clicommands/CompileCommand.php
index 4f08b2844..036769175 100644
--- a/modules/translation/application/clicommands/CompileCommand.php
+++ b/modules/translation/application/clicommands/CompileCommand.php
@@ -15,7 +15,7 @@ use Icinga\Module\Translation\Util\GettextTranslationHelper;
  * Domains are the global one 'icinga' and all available and enabled modules
  * identified by their name.
  *
- * Once a PO-file is compiled it's content is used by Icinga Web 2 to display
+ * Once a PO-file is compiled its content is used by Icinga Web 2 to display
  * messages in the configured language.
  */
 class CompileCommand extends TranslationCommand
diff --git a/modules/translation/doc/translation.md b/modules/translation/doc/translation.md
index 55dc415ad..308eae6a8 100644
--- a/modules/translation/doc/translation.md
+++ b/modules/translation/doc/translation.md
@@ -109,7 +109,7 @@ When you are done, just save your new settings.
 
 To work with Icinga Web 2 .po files, you can open for e.g. the german icinga.po file which is located under
 `application/locale/de_DE/LC_MESSAGES/icinga.po`, as shown below, you will get then a full list of all available
-translation strings for the core application. Each module names it's translation files `%module_name%.po`. For a
+translation strings for the core application. Each module names its translation files `%module_name%.po`. For a
 module called __yourmodule__ the .po translation file will be named `yourmodule.po`.
 
 
@@ -196,4 +196,4 @@ The last step is to compile the __yourmodule.po__ to the __yourmodule.mo__:
     icingacli translation compile module development ll_CC
 
 At this moment, everywhere in the module where the `Dummy` should be translated, it would returns the translated
-string `Attrappe`.
\ No newline at end of file
+string `Attrappe`.
diff --git a/modules/translation/module.info b/modules/translation/module.info
index 9934ec931..ebe121ebc 100644
--- a/modules/translation/module.info
+++ b/modules/translation/module.info
@@ -2,6 +2,6 @@ Module: translation
 Version: 2.0.0~alpha4
 Description: Translation module
  This module allows developers and translators to translate Icinga Web 2 and
- it's modules for multiple languages. You do not need this module to run an
+ its modules for multiple languages. You do not need this module to run an
  internationalized web frontend. This is only for people who want to contribute
  translations or translate just their own moduls.
diff --git a/packages/debian/control b/packages/debian/control
index 560b2ef65..73d0b57a3 100644
--- a/packages/debian/control
+++ b/packages/debian/control
@@ -24,7 +24,7 @@ Package: icingaweb-module-doc
 Architecture: any
 Depends: icingaweb-common
 Description: Icingaweb documentation module
- This module renders documentation for Icingaweb and it's modules
+ This module renders documentation for Icingaweb and its modules
 
 Package: icingaweb-module-monitoring
 Architecture: any
@@ -42,7 +42,7 @@ Package: icingaweb-module-test
 Architecture: any
 Depends: icingacli
 Description: Icingaweb test module
- Use this module to run unit tests against Icingaweb or any of it's modules
+ Use this module to run unit tests against Icingaweb or any of its modules
 
 Package: icingaweb-module-translation
 Architecture: any
@@ -54,7 +54,7 @@ Package: icingacli
 Architecture: any
 Depends: icingaweb-common, php5-cli (>= 5.3.2)
 Description: Icinga CLI tool
- The Icinga CLI allows one to access it's Icinga monitoring
+ The Icinga CLI allows one to access its Icinga monitoring
  system from a terminal. 
  .
  The CLI is based on the Icinga PHP libraries
diff --git a/test/php/library/Icinga/File/Ini/IniWriterTest.php b/test/php/library/Icinga/File/Ini/IniWriterTest.php
index 56f7fbf3f..4dc94a63a 100644
--- a/test/php/library/Icinga/File/Ini/IniWriterTest.php
+++ b/test/php/library/Icinga/File/Ini/IniWriterTest.php
@@ -726,7 +726,7 @@ EOD;
     }
 
     /**
-     * Write a INI-configuration string to a temporary file and return it's path
+     * Write a INI-configuration string to a temporary file and return its path
      *
      * @param   string      $config     The config string to write
      *