Patrick O'Sullivan (born 1985) is an American ice hockey player.

Patrick O'Sullivan may also refer to:

• Patrick O'Sullivan (author), Irish author and railway historian from Cahersiveen
• Patrick O'Sullivan (businessman) (born 1949), Irish businessman, chairman of Old Mutual
• Patrick O'Sullivan (lawyer) (1835–1887), British lawyer
• Patrick O'Sullivan (Queensland politician) (1818–1904), Legislative Assembly of Queensland member from Ipswich, 1860–1863
• Patrick B. O'Sullivan (1887–1978), U.S. Representative from Connecticut

• Patrick O'Sullivan, convicted of the murder of Patrick Henry Cronin in 1889
• Patrick O'Sullivan, actor who portrayed Chris in The Cavanaughs web series