A test program was performed on cold-formed steel oval hollow sections under axial compression. The test specimens were cold-rolled into oval hollow sections having flat web plates and semi-circle flanges. The test program included a total of 28 column specimens that was separated into four series of different cross-sectional dimensions. Each series of test involved at least 6 specimens of different lengths to obtain a column curve. The columns were compressed between fixed ends. Overall geometric imperfections of the column specimens were measured prior to testing. The failure modes of the specimens included flexural buckling, local buckling, material yielding and interaction between local and overall buckling. Material properties of each series of specimens at the flat and curved portions were determined from tensile coupon tests. It should be noted that the current design specifications for cold-formed steel structures do not cover the design of oval hollow sections. Hence, certain assumptions on the calculation of effective width have been made in this study. The test strengths were compared with the design strengths predicted by the North American, Australian/New Zealand and European specifications for cold-formed steel structures. Furthermore, reliability analysis was also performed. It is shown that the design strengths predicted by the three specifications are generally conservative.