A　comprehensive　experimental　and　numerical　study　on　flexural　buckling　behaviour　of　welded　stainless　steel　box-section　beam-columns　is　presented　in　this　paper.　A　total　of　ten　test　specimens　were　prepared　and　tested　subjected　to　eccentric　compression.　The　cross-section　and　length　of　the　test　specimens　were　carefully　designed　by　referring　to　existing　design　specifications　to　be　insusceptible　to　local　buckling.　The　full　experimental　load　versus　deformation　and　load　versus　strain　curves　were　obtained.　Prior　to　member　testing,　both　material　tests　and　geometric　imperfection　measurements　were　conducted　and　reported　in　detail.　Finite　element　(FE)　models　were　developed　and　validated　against　the　obtained　beam-column　test　results　afterwards,　which　were　utilised　to　perform　parametric　studies　on　the　flexural　buckling　behaviour,　generating　sufficient　numerical　data　points.　Based　on　the　obtained　test　and　FE　results,　the　design　methods　provided　in　EN　1993-1-4+A1　and　AISC　DG　27　were　assessed.　It　was　shown　that　both　EN　1993-1-4+A1　and　AISC　DG　27　provided　generally　conservative　and　scattered　predictions　for　the　buckling　resistance　of　welded　stainless　steel　box-section　beam-columns.　Moreover,　a　newly　revised　proposed　interaction　factor　was　proposed　in　the　framework　of　EN　1993-1-4+A1,　and　strength　predictions　with　reduced　scatter　were　therefore　achieved.　(C)　2019　Elsevier　Ltd.　All　rights　reserved.