| QAbstractButton | The abstract base class of button widgets, providing functionality common to buttons | 
| QAbstractGraphicsShapeItem | Common base for all path items | 
| QAbstractItemDelegate | Used to display and edit data items from a model | 
| QAbstractItemView | The basic functionality for item view classes | 
| QAbstractScrollArea | Scrolling area with on-demand scroll bars | 
| QAbstractSlider | Integer value within a range | 
| QAbstractSpinBox | Spinbox and a line edit to display values | 
| QAction | Abstract user interface action that can be inserted into widgets | 
| QActionGroup | Groups actions together | 
| QApplication | Manages the GUI application's control flow and main settings | 
| QBoxLayout | Lines up child widgets horizontally or vertically | 
| QButtonGroup | Container to organize groups of button widgets | 
| QCDEStyle | CDE look and feel | 
| QCalendarWidget | Monthly based calendar widget allowing the user to select a date | 
| QCheckBox | Checkbox with a text label | 
| QCleanlooksStyle | Widget style similar to the Clearlooks style available in GNOME | 
| QColorDialog | Dialog widget for specifying colors | 
| QColormap | Maps device independent QColors to device dependent pixel values | 
| QColumnView | Model/view implementation of a column view | 
| QComboBox | Combined button and popup list | 
| QCommandLinkButton | Vista style command link button | 
| QCommonStyle | Encapsulates the common Look and Feel of a GUI | 
| QCompleter | Completions based on an item model | 
| QDataWidgetMapper | Mapping between a section of a data model to widgets | 
| QDateEdit | Widget for editing dates based on the QDateTimeEdit widget | 
| QDateTimeEdit | Widget for editing dates and times | 
| QDesktopWidget | Access to screen information on multi-head systems | 
| QDial | Rounded range control (like a speedometer or potentiometer) | 
| QDialog | The base class of dialog windows | 
| QDialogButtonBox | Widget that presents buttons in a layout that is appropriate to the current widget style | 
| QDockWidget | Widget that can be docked inside a QMainWindow or floated as a top-level window on the desktop | 
| QDoubleSpinBox | Spin box widget that takes doubles | 
| QErrorMessage | Error message display dialog | 
| QFileDialog | Dialog that allow users to select files or directories | 
| QFileIconProvider | File icons for the QDirModel and the QFileSystemModel classes | 
| QFileSystemModel | Data model for the local filesystem | 
| QFocusFrame | Focus frame which can be outside of a widget's normal paintable area | 
| QFontComboBox | Combobox that lets the user select a font family | 
| QFontDialog | Dialog widget for selecting a font | 
| QFormLayout | Manages forms of input widgets and their associated labels | 
| QFrame | The base class of widgets that can have a frame | 
| QGesture | Represents a gesture, containing properties that describe the corresponding user input | 
| QGestureEvent | The description of triggered gestures | 
| QGestureRecognizer | The infrastructure for gesture recognition | 
| QGraphicsAnchor | Represents an anchor between two items in a QGraphicsAnchorLayout | 
| QGraphicsAnchorLayout | Layout where one can anchor widgets together in Graphics View | 
| QGraphicsBlurEffect | Blur effect | 
| QGraphicsColorizeEffect | Colorize effect | 
| QGraphicsDropShadowEffect | Drop shadow effect | 
| QGraphicsEffect | The base class for all graphics effects | 
| QGraphicsEllipseItem | Ellipse item that you can add to a QGraphicsScene | 
| QGraphicsGridLayout | Grid layout for managing widgets in Graphics View | 
| QGraphicsItem | The base class for all graphical items in a QGraphicsScene | 
| QGraphicsItemAnimation | Simple animation support for QGraphicsItem | 
| QGraphicsItemGroup | Container that treats a group of items as a single item | 
| QGraphicsLayout | The base class for all layouts in Graphics View | 
| QGraphicsLayoutItem | Can be inherited to allow your custom items to be managed by layouts | 
| QGraphicsLineItem | Line item that you can add to a QGraphicsScene | 
| QGraphicsLinearLayout | Horizontal or vertical layout for managing widgets in Graphics View | 
| QGraphicsObject | Base class for all graphics items that require signals, slots and properties | 
| QGraphicsOpacityEffect | Opacity effect | 
| QGraphicsPathItem | Path item that you can add to a QGraphicsScene | 
| QGraphicsPixmapItem | Pixmap item that you can add to a QGraphicsScene | 
| QGraphicsPolygonItem | Polygon item that you can add to a QGraphicsScene | 
| QGraphicsProxyWidget | Proxy layer for embedding a QWidget in a QGraphicsScene | 
| QGraphicsRectItem | Rectangle item that you can add to a QGraphicsScene | 
| QGraphicsRotation | Rotation transformation around a given axis | 
| QGraphicsScale | Scale transformation | 
| QGraphicsScene | Surface for managing a large number of 2D graphical items | 
| QGraphicsSceneContextMenuEvent | Context menu events in the graphics view framework | 
| QGraphicsSceneDragDropEvent | Events for drag and drop in the graphics view framework | 
| QGraphicsSceneEvent | Base class for all graphics view related events | 
| QGraphicsSceneHelpEvent | Events when a tooltip is requested | 
| QGraphicsSceneHoverEvent | Hover events in the graphics view framework | 
| QGraphicsSceneMouseEvent | Mouse events in the graphics view framework | 
| QGraphicsSceneMoveEvent | Events for widget moving in the graphics view framework | 
| QGraphicsSceneResizeEvent | Events for widget resizing in the graphics view framework | 
| QGraphicsSceneWheelEvent | Wheel events in the graphics view framework | 
| QGraphicsSimpleTextItem | Simple text path item that you can add to a QGraphicsScene | 
| QGraphicsTextItem | Text item that you can add to a QGraphicsScene to display formatted text | 
| QGraphicsTransform | Abstract base class for building advanced transformations on QGraphicsItems | 
| QGraphicsView | Widget for displaying the contents of a QGraphicsScene | 
| QGraphicsWidget | The base class for all widget items in a QGraphicsScene | 
| QGridLayout | Lays out widgets in a grid | 
| QGroupBox | Group box frame with a title | 
| QGtkStyle | Widget style rendered by GTK+ | 
| QHBoxLayout | Lines up widgets horizontally | 
| QHeaderView | Header row or header column for item views | 
| QInputDialog | Simple convenience dialog to get a single value from the user | 
| QItemDelegate | Display and editing facilities for data items from a model | 
| QItemEditorCreator | Makes it possible to create item editor creator bases without subclassing QItemEditorCreatorBase | 
| QItemEditorCreatorBase | Abstract base class that must be subclassed when implementing new item editor creators | 
| QItemEditorFactory | Widgets for editing item data in views and delegates | 
| QKeyEventTransition | Transition for key events | 
| QLCDNumber | Displays a number with LCD-like digits | 
| QLabel | Text or image display | 
| QLayout | The base class of geometry managers | 
| QLayoutItem | Abstract item that a QLayout manipulates | 
| QLineEdit | One-line text editor | 
| QListView | List or icon view onto a model | 
| QListWidget | Item-based list widget | 
| QListWidgetItem | Item for use with the QListWidget item view class | 
| QMacCocoaViewContainer | Widget for Mac OS X that can be used to wrap arbitrary Cocoa views (i.e., NSView subclasses) and insert them into Qt hierarchies | 
| QMacNativeWidget | Widget for Mac OS X that provides a way to put Qt widgets into Carbon or Cocoa hierarchies depending on how Qt was configured | 
| QMacPasteboardMime | Converts between a MIME type and a Uniform Type Identifier (UTI) format | 
| QMacStyle | Mac OS X style using the Apple Appearance Manager | 
| QMainWindow | Main application window | 
| QMdiArea | Area in which MDI windows are displayed | 
| QMdiSubWindow | Subwindow class for QMdiArea | 
| QMenu | Menu widget for use in menu bars, context menus, and other popup menus | 
| QMenuBar | Horizontal menu bar | 
| QMessageBox | Modal dialog for informing the user or for asking the user a question and receiving an answer | 
| QMotifStyle | Motif look and feel | 
| QMouseEventTransition | Transition for mouse events | 
| QPanGesture | Describes a panning gesture made by the user | 
| QPinchGesture | Describes a pinch gesture made by the user | 
| QPlainTextDocumentLayout | Implements a plain text layout for QTextDocument | 
| QPlainTextEdit | Widget that is used to edit and display plain text | 
| QPlastiqueStyle | Widget style similar to the Plastik style available in KDE | 
| QProgressBar | Horizontal or vertical progress bar | 
| QProgressDialog | Feedback on the progress of a slow operation | 
| QProxyStyle | Convenience class that simplifies dynamically overriding QStyle elements | 
| QPushButton | Command button | 
| QRadioButton | Radio button with a text label | 
| QRubberBand | Rectangle or line that can indicate a selection or a boundary | 
| QScrollArea | Scrolling view onto another widget | 
| QScrollBar | Vertical or horizontal scroll bar | 
| QScroller | Enables kinetic scrolling for any scrolling widget or graphics item | 
| QScrollerProperties | Stores the settings for a QScroller | 
| QSessionManager | Access to the session manager | 
| QShortcut | Used to create keyboard shortcuts | 
| QSizeGrip | Resize handle for resizing top-level windows | 
| QSizePolicy | Layout attribute describing horizontal and vertical resizing policy | 
| QSlider | Vertical or horizontal slider | 
| QSpacerItem | Blank space in a layout | 
| QSpinBox | Spin box widget | 
| QSplashScreen | Splash screen that can be shown during application startup | 
| QSplitter | Implements a splitter widget | 
| QSplitterHandle | Handle functionality of the splitter | 
| QStackedLayout | Stack of widgets where only one widget is visible at a time | 
| QStackedWidget | Stack of widgets where only one widget is visible at a time | 
| QStandardItem | Item for use with the QStandardItemModel class | 
| QStandardItemEditorCreator | The possibility to register widgets without having to subclass QItemEditorCreatorBase | 
| QStandardItemModel | Generic model for storing custom data | 
| QStatusBar | Horizontal bar suitable for presenting status information | 
| QStyle | Abstract base class that encapsulates the look and feel of a GUI | 
| QStyleFactory | Creates QStyle objects | 
| QStyleHintReturn | Style hints that return more than basic data types | 
| QStyleHintReturnMask | Style hints that return a QRegion | 
| QStyleHintReturnVariant | Style hints that return a QVariant | 
| QStyleOption | Stores the parameters used by QStyle functions | 
| QStyleOptionButton | Used to describe the parameters for drawing buttons | 
| QStyleOptionComboBox | Used to describe the parameter for drawing a combobox | 
| QStyleOptionComplex | Used to hold parameters that are common to all complex controls | 
| QStyleOptionDockWidget | Used to describe the parameters for drawing a dock widget | 
| QStyleOptionFocusRect | Used to describe the parameters for drawing a focus rectangle with QStyle | 
| QStyleOptionFrame | Used to describe the parameters for drawing a frame | 
| QStyleOptionGraphicsItem | Used to describe the parameters needed to draw a QGraphicsItem | 
| QStyleOptionGroupBox | Describes the parameters for drawing a group box | 
| QStyleOptionHeader | Used to describe the parameters for drawing a header | 
| QStyleOptionMenuItem | Used to describe the parameter necessary for drawing a menu item | 
| QStyleOptionProgressBar | Used to describe the parameters necessary for drawing a progress bar | 
| QStyleOptionRubberBand | Used to describe the parameters needed for drawing a rubber band | 
| QStyleOptionSizeGrip | Used to describe the parameter for drawing a size grip | 
| QStyleOptionSlider | Used to describe the parameters needed for drawing a slider | 
| QStyleOptionSpinBox | Used to describe the parameters necessary for drawing a spin box | 
| QStyleOptionTab | Used to describe the parameters for drawing a tab bar | 
| QStyleOptionTabBarBase | Used to describe the base of a tab bar, i.e. the part that the tab bar usually overlaps with | 
| QStyleOptionTabWidgetFrame | Used to describe the parameters for drawing the frame around a tab widget | 
| QStyleOptionTitleBar | Used to describe the parameters for drawing a title bar | 
| QStyleOptionToolBar | Used to describe the parameters for drawing a toolbar | 
| QStyleOptionToolBox | Used to describe the parameters needed for drawing a tool box | 
| QStyleOptionToolButton | Used to describe the parameters for drawing a tool button | 
| QStyleOptionViewItem | Used to describe the parameters used to draw an item in a view widget | 
| QStylePainter | Convenience class for drawing QStyle elements inside a widget | 
| QStylePlugin | Abstract base for custom QStyle plugins | 
| QStyledItemDelegate | Display and editing facilities for data items from a model | 
| QSwipeGesture | Describes a swipe gesture made by the user | 
| QSystemTrayIcon | Icon for an application in the system tray | 
| QTabBar | Tab bar, e.g. for use in tabbed dialogs | 
| QTabWidget | Stack of tabbed widgets | 
| QTableView | Default model/view implementation of a table view | 
| QTableWidget | Item-based table view with a default model | 
| QTableWidgetItem | Item for use with the QTableWidget class | 
| QTableWidgetSelectionRange | Way to interact with selection in a model without using model indexes and a selection model | 
| QTapAndHoldGesture | Describes a tap-and-hold (aka LongTap) gesture made by the user | 
| QTapGesture | Describes a tap gesture made by the user | 
| QTextBrowser | Rich text browser with hypertext navigation | 
| QTextEdit | Widget that is used to edit and display both plain and rich text | 
| QTileRules | The rules used to draw a pixmap or image split into nine segments | 
| QTimeEdit | Widget for editing times based on the QDateTimeEdit widget | 
| QToolBar | Movable panel that contains a set of controls | 
| QToolBox | Column of tabbed widget items | 
| QToolButton | Quick-access button to commands or options, usually used inside a QToolBar | 
| QToolTip | Tool tips (balloon help) for any widget | 
| QTreeView | Default model/view implementation of a tree view | 
| QTreeWidget | Tree view that uses a predefined tree model | 
| QTreeWidgetItem | Item for use with the QTreeWidget convenience class | 
| QTreeWidgetItemIterator | Way to iterate over the items in a QTreeWidget instance | 
| QUndoCommand | The base class of all commands stored on a QUndoStack | 
| QUndoGroup | Group of QUndoStack objects | 
| QUndoStack | Stack of QUndoCommand objects | 
| QUndoView | Displays the contents of a QUndoStack | 
| QVBoxLayout | Lines up widgets vertically | 
| QWhatsThis | Simple description of any widget, i.e. answering the question "What's This?" | 
| QWidget | The base class of all user interface objects | 
| QWidgetAction | Extends QAction by an interface for inserting custom widgets into action based containers, such as toolbars | 
| QWidgetItem | Layout item that represents a widget | 
| QWindowsStyle | Microsoft Windows-like look and feel | 
| QWindowsVistaStyle | Look and feel suitable for applications on Microsoft Windows Vista | 
| QWindowsXPStyle | Microsoft Windows XP-like look and feel | 
| QWizard | Framework for wizards | 
| QWizardPage | The base class for wizard pages |