Cian O'Sullivan (born 1998) is an Irish hurler who plays for Dublin Championship club St. Brigid's and at inter-county level with the Dublin senior hurling team. He usually lines out as a left corner-forward.
A member of the St. Brigid's club in Castleknock, O'Sullivan first came to prominence on the inter-county scene with the Dublin minor team that won the 2016 Leinster Minor Championship. He subsequently spent two seasons with the Dublin under-21 team, while simultaneously lining out with Trinity College in the Fitzgibbon Cup. O'Sullivan made his senior debut during the 2017 National League.