### - o -

- obj_len : SaveLoadParams
- occupied : RoadStop::Entry
- offs_base : SaveLoadParams
- offset : CompanyManagerFaceBitsInfo , LoggedChange
- offsets : LanguagePackHeader
- oil_refinery : ExtraPaletteValues
- oil_refinery_limit : GameCreationSettings
- okay : PBSTileInfo
- old_tile : GetNewVehiclePosResult
- oldval : LoggedChange
- online : NetworkGameList
- opf : PathfinderSettings
- order : RefitWindow , GameSettings , Listing
- order_review_system : GUISettings
- orig_list : NewGRFWindow
- other_company_name : CompanyNewsInformation
- override : GRFFileProps
- own_name : LanguagePackHeader
- owner : CargoPayment , Industry , TileDesc , Window , BaseStation
- owner_type : TileDesc