| Fullname: | Liam O'Sullivan |
| Birth Date: | 28 October 1981 |
| Birth Place: | Edinburgh, Scotland |
| Death Place: | Haddington, Scotland |
| Position: | Defender |
| Youthyears1: | –1997 |
| Youthclubs1: | Hutchison Vale |
| Youthyears2: | 1997–2000 |
| Youthclubs2: | Hibernian |
| Years1: | 2000–2002 |
| Clubs1: | Hibernian |
| Caps1: | 0 |
| Goals1: | 0 |
| Years2: | 2000 |
| Clubs2: | → Keflavík (loan) |
| Caps2: | 7 |
| Goals2: | 0 |
| Years3: | 2000 |
| Clubs3: | → Clydebank (loan) |
| Caps3: | 5 |
| Goals3: | 0 |
| Years4: | 2000 |
| Clubs4: | → Brechin City (loan) |
| Caps4: | 1 |
| Goals4: | 0 |
Liam O'Sullivan (28 October 1981 – 29 April 2002) was a Scottish football player, who played as a defender for Hibernian, Clydebank and Brechin City.
O'Sullivan achieved success in youth football with Hutchison Vale, and signed a five-year contract with Hibernian after leaving school in 1997.[1] In May 2000, he joined Icelandic top division club Keflavík on loan. He went on to play seven league matches for the club,[2] before being recalled by Hibernian manager Alex McLeish two months later.[3] O'Sullivan played in the Scottish Football League for both Clydebank and Brechin City during 2000, but then suffered a serious knee injury.[1] As he was battling to recover from that injury, O'Sullivan was found dead in a friend's house in Haddington.[1] It was suspected that a drugs overdose, including methadone and ecstasy, was the cause of death.[1]