The　combined　use　of　a　fiber-reinforced　polymer　(FRP)　tube　with　steel　and　concrete　to　form　hybrid　structural　members　has　attracted　increasing　research　attention.　Hybrid　FRP-concrete-steel　multitube　concrete　columns　(MTCCs)　are　a　new　form　of　such　members,　comprising　an　external　FRP　tube　and　a　number　of　internal　steel　tubes,　with　all　the　space　inside　the　tubes　filled　with　concrete.　Hybrid　MTCCs　allow　the　use　of　small-scale　standard　steel　tube　products　to　construct　large-scale　columns,　and　these　possess　many　advantages　including　excellent　ductility,　as　demonstrated　by　recent　studies.　The　existing　studies　on　MTCCs,　however,　have　been　limited　to　the　testing　of　small-scale　specimens.　For　a　new　column　form　particularly　suitable　for　large-scale　construction,　the　potential　size　effect　on　the　behavior　of　MTCCs　needs　to　be　clarified.　This　paper　presents　the　first-ever　experimental　study　on　large-scale　MTCCs　through　the　testing　of　specimens　with　an　outer　diameter　(for　circular　specimens)　or　a　side　length　(for　square　specimens)　of　500　mm　and　a　height　of　1,500　mm.　The　configuration　of　steel　tubes　in　these　specimens,　designed　to　be　similar　to　real　columns,　is　different　from　those　in　the　small-scale　MTCCs　reported　by　the　existing　studies.　The　test　results　show　that　the　large-scale　MTCCs　all　possess　excellent　structural　performance　including　ample　ductility　and　that　the　size　effect　appears　to　be　negligible　for　MTCCs　with　sufficient　confinement.　The　test　results　also　show　that　the　configuration　of　steel　tubes　may　have　a　significant　effect　on　the　behavior　of　the　confined　concrete　in　MTCCs.　In　addition,　an　analytical　method　based　on　the　transformed　section　approach　and　an　existing　model　for　FRP-confined　concrete-filled　steel　tubes　is　presented　and　shown　to　provide　close　predictions　of　the　test　results　in　the　present　study.