| Steve So'oialo | |
| Birth Name: | Steven So'oialo |
| Birth Date: | 11 May 1977 |
| Birth Place: | Apia, Samoa |
| Weight: | 13 st (83 kg) |
| Relatives: | Rodney So'oialo, James So'oialo |
| Ru Currentteam: | Harlequins |
| Ru Position: | Scrum-half |
| Youthyears1: | |
| Ru Clubyears: | 1998–04 2004– |
| Ru Proclubs: | Orrell Harlequins |
| Ru Clubcaps: | 75 |
| Ru Clubpoints: | (45) |
| Super14years: | |
| Ru Nationalyears: | 1998– 2004– |
| Ru Nationalteam: | Samoa Pacific Islanders |
| Ru Nationalcaps: | 38 2 |
| Ru Nationalpoints: | (25) (0) |
| Repsevensyears1: | |
Steven So'oialo (born 11 May 1977 in Apia, Samoa) is a Samoan rugby union footballer. He played scrum-half for English club Harlequins and formerly Orrell. He played for Manu Samoa in the 1999 and 2003 Rugby World Cup. He also played for the Pacific Islanders team in 2004. He is the older brother of New Zealand All Blacks rugby union international and Wellington Hurricanes Super Rugby player, Rodney So'oialo, and of James So'oialo, who has also represented Samoa internationally.