Sean O'Neill
Sean O'Neillmay refer to:
- Seán O'Neill, Gaelic football player for Down
- Sean O'Neill (table tennis), American table tennis player and coach
- Seán O'Neill (hurler), Irish hurler for Limerick
- Sean O'Neill (rower), Irish / New Zealand rower
- Sean O'Neill (actor), Canadian, actor and arts professional
- Sean O'Neill (footballer), association footballer
- Sean O'Neill (Louth Gaelic footballer), Gaelic football player for Louth
- Sean O'Neill, Irish musician, better known as John O'Neill (guitarist)
- Sean O'Neill (diplomat), American diplomat