| QBitArray | Array of bits | 
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| QBitmap | Monochrome (1-bit depth) pixmaps | 
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| QBrush | Defines the fill pattern of shapes drawn by QPainter | 
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| QByteArray | Array of bytes | 
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| QCache | Template class that provides a cache | 
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| QContiguousCache | Template class that provides a contiguous cache | 
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| QCursor | Mouse cursor with an arbitrary shape | 
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| QDir | Access to directory structures and their contents | 
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| QFileInfo | System-independent file information | 
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| QFont | Specifies a font used for drawing text | 
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| QFontInfo | General information about fonts | 
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| QFontMetrics | Font metrics information | 
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| QFontMetricsF | Font metrics information | 
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| QGLColormap | Used for installing custom colormaps into a QGLWidget | 
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| QGradient | Used in combination with QBrush to specify gradient fills | 
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| QHash | Template class that provides a hash-table-based dictionary | 
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| QIcon | Scalable icons in different modes and states | 
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| QImage | Hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device | 
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| QKeySequence | Encapsulates a key sequence as used by shortcuts | 
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| QLinkedList | Template class that provides linked lists | 
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| QList | Template class that provides lists | 
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| QLocale | Converts between numbers and their string representations in various languages | 
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| QMap | Template class that provides a skip-list-based dictionary | 
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| QMultiHash | Convenience QHash subclass that provides multi-valued hashes | 
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| QMultiMap | Convenience QMap subclass that provides multi-valued maps | 
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| QPainterPath | Container for painting operations, enabling graphical shapes to be constructed and reused | 
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| QPalette | Contains color groups for each widget state | 
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| QPen | Defines how a QPainter should draw lines and outlines of shapes | 
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| QPicture | Paint device that records and replays QPainter commands | 
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| QPixmap | Off-screen image representation that can be used as a paint device | 
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| QPolygon | Vector of points using integer precision | 
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| QPolygonF | Vector of points using floating point precision | 
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| QQueue | Generic container that provides a queue | 
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| QRegExp | Pattern matching using regular expressions | 
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| QRegion | Specifies a clip region for a painter | 
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| QSet | Template class that provides a hash-table-based set | 
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| QSqlField | Manipulates the fields in SQL database tables and views | 
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| QSqlQuery | Means of executing and manipulating SQL statements | 
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| QSqlRecord | Encapsulates a database record | 
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| QStack | Template class that provides a stack | 
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| QString | Unicode character string | 
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| QStringList | List of strings | 
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| QTextBoundaryFinder | Way of finding Unicode text boundaries in a string | 
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| QTextCursor | Offers an API to access and modify QTextDocuments | 
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| QTextDocumentFragment | Represents a piece of formatted text from a QTextDocument | 
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| QTextFormat | Formatting information for a QTextDocument | 
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| QUrl | Convenient interface for working with URLs | 
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| QVariant | Acts like a union for the most common Qt data types | 
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| QVector | Template class that provides a dynamic array | 
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| QX11Info | Information about the X display configuration | 
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