Patrick O'Brien

• Paddy O'Brien (disambiguation)
• Pat O'Brien (Irish politician)
• Pat O'Brien (disambiguation)
• Patrick Cotter O'Brien
• Patrick Joseph O'Brien
• Patrick K. O'Brien
• Patrick O'Brian
• Patrick O'Brien (Australian politician)
• Patrick O'Brien (artist)
• Patrick O'Brien (footballer, born 1875)
• Patrick O'Brien (footballer, born 1884)
• Patrick O'Brien (musician)
• Patrick O'Brien (political scientist)
• Patrick Thomas O'Brien
• Sir Patrick O'Brien, 2nd Baronet