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• ObjectChangeInfo() : newgrf.cpp
• OffsetGroundSprite() : viewport.cpp , viewport_func.h
• OnStartGame() : openttd.cpp
• OnStartScenario() : openttd.cpp
• OnTick_Companies() : company_cmd.cpp , landscape.cpp
• OnTick_LinkGraph() : landscape.cpp , linkgraphschedule.cpp
• OnTick_Town() : landscape.cpp , town_cmd.cpp
• OpenBankFile() : sound.cpp
• OpenCachedSpriteFile() : spritecache.cpp , spritecache.h
• openttd_main() : openttd.h , openttd.cpp
• operator!=() : multimap.hpp
• operator==() : multimap.hpp
• OppositeCorner() : slope_func.h
• OrderConditionCompare() : order_cmd.cpp
• OrderGoesToStation() : order_cmd.cpp
• OtherAxis() : direction_func.h
• OTTD2FS() : win32.cpp
• ottd_cpuid() : cpu.h , cpu.cpp
• OutputContentState() : console_cmds.cpp