Sean O'Neill is the name of:

• Seán O'Neill (born 1938), Gaelic football player for Down
• Sean O'Neill (table tennis) (born 1967), American table tennis player and coach
• Seán O'Neill (hurler) (born 1972), Irish hurler for Limerick
• Sean O'Neill (rower) (born 1980), Irish / New Zealand rower
• Sean O'Neill (actor) (born 1985), Canadian, actor and arts professional
• Sean O'Neill (footballer) (born 1988), 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)

See also

• Sean O'Neal (born 1977), actor