- GtkLayoutManager — Base class for layout manager
- GtkLayoutChild — An object containing layout properties
- GtkBinLayout — A layout manager for bin-like widgets
- GtkBoxLayout — Layout manager for placing all children in a single row or column
- GtkCenterLayout — A centering layout
- GtkFixedLayout — A layout manager that allows positioning at fixed coordinates
- GtkGridLayout — Layout manager for grid-like widgets
- GtkOverlayLayout — Layout manager that places widgets as overlays
- GtkCustomLayout — A convenience layout manager
- GtkConstraintLayout — A layout manager using constraints
- GtkConstraint — The description of a constraint
- GtkConstraintGuide — An invisible constraint target