| Dally O'Brien | |
| Fullname: | Henry Dalziel O'Brien |
| Birth Date: | 31 October 1918 |
| Birth Place: | Seymour, Victoria |
| Originalteam: | Kensington |
| Height: | 182 cm |
| Weight: | 76 kg |
| Statsend: | 1949 |
| Years1: | 1938–1949 |
| Club1: | North Melbourne |
| Games Goals1: | 137 (63) |
Henry Dalziel 'Dally' O'Brien (31 October 1918 – 15 August 1996)[1] was an Australian rules footballer who played with North Melbourne in the VFL during the 1940s. O'Brien played 137 games for North Melbourne and was club captain in 1944 and 1945. He won their best and fairest award in 1948, also finishing equal 8th in the Brownlow Medal count.