This　study　investigates　the　behavior　of　ultra-high-performance　concrete　(UHPC)　encased　concrete　filled　steel　tubular　(CFST)　stub　columns　under　eccentric　compression.　Nine　specimens　were　tested　to　evaluate　the　influence　of　load　eccentricity,　reinforcement　ratio,　and　slenderness　ratio　on　the　failure　mode,　axial　load-axial　displacement　curve,　load　bearing　capacity,　second-order　effect,　and　ductility　of　the　members.　A　finite　element　model　was　developed　and　validated　against　the　experimental　results.　The　model　was　used　to　analyze　the　load　distribution,　stress　development,　and　contact　stress　between　different　components　of　the　members.　Parametric　studies　were　conducted　to　clarify　the　influence　of　steel　fiber　content,　compressive　strength　of　core　concrete,　slenderness　ratio,　steel　yield　strength,　and　eccentricity　on　the　behavior　of　the　members.　The　accuracy　of　existing　code　provisions　for　calculating　the　load　bearing　capacity　of　UHPC　encased　CFST　stub　columns　under　eccentric　loading　was　evaluated.　The　findings　of　this　study　provide　valuable　insights　for　the　design　and　application　of　UHPC　encased　CFST　stub　columns　in　practical　engineering　projects.　©　2025　Institution　of　Structural　Engineers