### - d -

- DepotCommand : vehicle_type.h
- DepotWindowWidgets : depot_gui.cpp
- DestType : network_type.h
- DeterministicSpriteGroupAdjustOperation : newgrf_spritegroup.h
- DiagDirDiff : direction_type.h
- DiagDirection : direction_type.h
- DirDiff : direction_type.h
- Direction : direction_type.h
- DisallowedRoadDirections : road_map.h
- DockToolbarWidgets : dock_gui.cpp
- DoCommandFlag : command_type.h
- DownloadStatusWindowWidgets : network_content_gui.cpp
- DropdownMenuWidgets : dropdown.cpp
- DynamicPlaceIndustriesWidgets : industry_gui.cpp