These classes provide automatic geometry (layout) management of widgets.
| QBoxLayout | Lines up child widgets horizontally or vertically | 
| QButtonGroup | Organizes QButton widgets in a group | 
| QGLayoutIterator | Abstract base class of internal layout iterators | 
| QGrid | Simple geometry management of its children | 
| QGridLayout | Lays out widgets in a grid | 
| QGroupBox | Group box frame with a title | 
| QHBox | Horizontal geometry management for its child widgets | 
| QHBoxLayout | Lines up widgets horizontally | 
| QHButtonGroup | Organizes QButton widgets in a group with one horizontal row | 
| QHGroupBox | Organizes widgets in a group with one horizontal row | 
| QLayout | The base class of geometry managers | 
| QLayoutItem | Abstract item that a QLayout manipulates | 
| QLayoutIterator | Iterators over QLayoutItem | 
| QSizePolicy | Layout attribute describing horizontal and vertical resizing policy | 
| QSpacerItem | Blank space in a layout | 
| QVBox | Vertical geometry management of its child widgets | 
| QVBoxLayout | Lines up widgets vertically | 
| QVButtonGroup | Organizes QButton widgets in a vertical column | 
| QVGroupBox | Organizes a group of widgets in a vertical column | 
| QWidgetItem | Layout item that represents a widget |