<p>This study addresses the lack of research on slender hybrid self-compacting concrete (SCC) columns subjected to eccentric loading, as previous investigations have mainly focused on short members. The aim is to experimentally evaluate the structural performance of slender reinforced concrete hybrid columns consisting of a self-compacting normal concrete (SC-NC) core confined by a self-compacting high-strength concrete (SC-HSC) outer shell. Six square columns (140 × 140 mm cross-section, 1260 mm height) were tested under uniaxial eccentric compression at three eccentricity-to-depth ratios (e/h = 0.25, 0.65, and 0.90). For each eccentricity level, one reference specimen with an SC-NC shell and one hybrid specimen with an SC-HSC shell were tested. The results indicated that the SC-HSC shell improved both axial load capacity and flexural response, particularly at small and large eccentricity ratios. On average, the axial and flexural strengths of the hybrid specimens were 27.03% and 26.19% higher than those of the reference specimens, respectively. The failure mechanism shifted from compression-controlled to flexural–compression dominated as eccentricity increased. The findings demonstrate that fully bonded SC-HC hybrid columns exhibit enhanced axial and flexural performance under uniaxial eccentric loading, making them suitable for structural applications requiring high load capacity and ductility.</p>