This　paper　investigates　the　compressive　behavior　of　circular　steel　tube-confined　reinforced　ultrahigh　performance　concrete　(UHPC)　columns.　An　experiment　was　conducted　consisting　of　axial　loading　applied　to　18　stub　columns　(lambda　=　4L/D　=　13),　including　steel　tube-confined　reinforced　UHPC　(STCRU)　columns,　steel　tube　confined　UHPC　(STCU)　columns,　UHPC-filled　steel　tube　(UFST)　columns,　steel　tube-confined　reinforced　concrete　(STCRC)　columns,　and　reinforced　UHPC　(RU)　columns.　The　compressive　behavior　was　also　investigated　by　varying　the　addition　of　steel　fibers.　The　failure　mode　of　all　the　columns　was　shear　failure　except　for　the　explosive　failure　of　the　RU　columns　without　steel　fibers　and　the　drum-type　failure　of　the　STCRC　columns.　Interestingly,　the　addition　of　steel　fibers　greatly　improved　the　strength　and　ductility　of　the　RU　columns.　Finally,　a　reasonable　formula　for　predicting　the　bearing　capacity　of　STCRU　columns　was　provided　to　overcome　the　application　limits　of　existing　specifications,　and　the　formula　can　describe　the　axial　bearing　capacity　of　stub　STCRU　columns　better　than　other　approaches.