| Paddy O'Brien | |
| Fullname: | Patrick Joseph O'Brien |
| Birth Date: | 16 April 1893 |
| Birth Place: | Footscray, Victoria |
| Death Place: | Newport, Victoria |
| Originalteam: | Yarraville |
| Height: | 183 cm |
| Weight: | 86 kg |
| Statsend: | 1926 |
| Years1: | 1913–1925 |
| Club1: | Carlton |
| Games Goals1: | 167 (7) |
| Years2: | 1925–1926 |
| Club2: | Footscray |
| Games Goals2: | 15 (0) |
| Games Goalstotal: | 182 (7) |
| Coachyears1: | 1925 |
| Coachclub1: | Carlton |
| Coachgames Wins1: | 2 (0–2–0) |
Patrick Joseph O'Brien (16 April 1893 – 25 March 1964) was an Australian rules footballer who played with Carlton in the Victorian Football League (VFL).[1]
O'Brien was a physically tough defender who usually played at centre half back. He was Carlton's captain in 1924, and was a member of Carlton's back-to-back premierships in 1914 and 1915.
In 1925, he commenced the season as Carlton's playing coach but lasted only two games due to disagreements within the team. He left to join Footscray during their inaugural VFL season but played just 15 games for the club.