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diff --git a/src/crepe/manager/ComponentManager.h b/src/crepe/manager/ComponentManager.h
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+#pragma once
+
+#include <memory>
+#include <typeindex>
+#include <unordered_map>
+#include <vector>
+
+#include "../Component.h"
+#include "../types.h"
+
+#include "Manager.h"
+
+namespace crepe {
+
+class GameObject;
+
+/**
+ * \brief Manages all components
+ * 
+ * This class manages all components. It provides methods to add, delete and get components.
+ */
+class ComponentManager : public Manager {
+	// TODO: This relation should be removed! I (loek) believe that the scene manager should
+	// create/destroy components because the GameObject's are stored in concrete Scene classes,
+	// which will in turn call GameObject's destructor, which will in turn call
+	// ComponentManager::delete_components_by_id or something. This is a pretty major change, so
+	// here is a comment and temporary fix instead :tada:
+	friend class SceneManager;
+
+public:
+	ComponentManager(Mediator & mediator);
+	~ComponentManager(); // dbg_trace
+
+	/**
+	 * \brief Create a new game object using the component manager
+	 *
+	 * \param name Metadata::name (required)
+	 * \param tag Metadata::tag (optional, empty by default)
+	 * \param position Transform::position (optional, origin by default)
+	 * \param rotation Transform::rotation (optional, 0 by default)
+	 * \param scale Transform::scale (optional, 1 by default)
+	 *
+	 * \returns GameObject interface
+	 *
+	 * \note This method automatically assigns a new entity ID
+	 */
+	GameObject new_object(const std::string & name, const std::string & tag = "",
+						  const vec2 & position = {0, 0}, double rotation = 0,
+						  double scale = 1);
+
+protected:
+	/**
+	 * GameObject is used as an interface to add/remove components, and the game programmer is
+	 * supposed to use it instead of interfacing with the component manager directly.
+	 */
+	friend class GameObject;
+	/**
+	 * \brief Add a component to the ComponentManager
+	 * 
+	 * This method adds a component to the ComponentManager. The component is created with the
+	 * given arguments and added to the ComponentManager.
+	 * 
+	 * \tparam T The type of the component
+	 * \tparam Args The types of the arguments
+	 * \param id The id of the GameObject this component belongs to
+	 * \param args The arguments to create the component
+	 * \return The created component
+	 */
+	template <typename T, typename... Args>
+	T & add_component(game_object_id_t id, Args &&... args);
+	/**
+	 * \brief Delete all components of a specific type and id
+	 * 
+	 * This method deletes all components of a specific type and id.
+	 * 
+	 * \tparam T The type of the component
+	 * \param id The id of the GameObject this component belongs to
+	 */
+	template <typename T>
+	void delete_components_by_id(game_object_id_t id);
+	/**
+	 * \brief Delete all components of a specific type
+	 * 
+	 * This method deletes all components of a specific type.
+	 * 
+	 * \tparam T The type of the component
+	 */
+	template <typename T>
+	void delete_components();
+	/**
+	 * \brief Delete all components of a specific id
+	 * 
+	 * This method deletes all components of a specific id.
+	 * 
+	 * \param id The id of the GameObject this component belongs to
+	 */
+	void delete_all_components_of_id(game_object_id_t id);
+	/**
+	 * \brief Delete all components
+	 * 
+	 * This method deletes all components.
+	 */
+	void delete_all_components();
+	/**
+	 * \brief Set a GameObject as persistent
+	 *
+	 * This method sets a GameObject as persistent. If a GameObject is persistent, its
+	 * components will not be deleted.
+	 *
+	 * \param id The id of the GameObject to set as persistent
+	 * \param persistent The persistent flag
+	 */
+	void set_persistent(game_object_id_t id, bool persistent);
+
+public:
+	/**
+	 * \brief Get all components of a specific type and id
+	 * 
+	 * This method gets all components of a specific type and id.
+	 * 
+	 * \tparam T The type of the component
+	 * \param id The id of the GameObject this component belongs to
+	 * \return A vector of all components of the specific type and id
+	 */
+	template <typename T>
+	RefVector<T> get_components_by_id(game_object_id_t id) const;
+	/**
+	 * \brief Get all components of a specific type
+	 * 
+	 * This method gets all components of a specific type.
+	 * 
+	 * \tparam T The type of the component
+	 * \return A vector of all components of the specific type
+	 */
+	template <typename T>
+	RefVector<T> get_components_by_type() const;
+
+private:
+	/**
+	 * \brief The components
+	 * 
+	 * This unordered_map stores all components. The key is the type of the component and the
+	 * value is a vector of vectors of unique pointers to the components.
+	 *
+	 * Every component type has its own vector of vectors of unique pointers to the components.
+	 * The first vector is for the ids of the GameObjects and the second vector is for the
+	 * components (because a GameObject might have multiple components).
+	 */
+	std::unordered_map<std::type_index, std::vector<std::vector<std::unique_ptr<Component>>>>
+		components;
+
+	//! Persistent flag for each GameObject
+	std::unordered_map<game_object_id_t, bool> persistent;
+
+	//! ID of next GameObject allocated by \c ComponentManager::new_object
+	game_object_id_t next_id = 0;
+};
+
+} // namespace crepe
+
+#include "ComponentManager.hpp"