| Hart Udy | |
| Birth Name: | Hart Udy |
| Birth Date: | 27 July 1857 |
| Birth Place: | Greytown, New Zealand |
| Death Place: | Napier, New Zealand |
| Ru Position: | Forward |
| Weight: | 82kg (181lb) |
| Repcaps1: | 0 |
| Reppoints1: | 0 |
| Repyears1: | 1884 |
| Ru Province1: | Wellington |
| Ru Provinceyears1: | 1882–84 |
| Occupation: | Blacksmith and wheelwright[1] |
| Relatives: | Dan Udy (cousin) |
| School: | Greytown High School |
Hart Udy (27 July 1857 - 6 August 1933) was a New Zealand rugby union player. A forward, Udy represented Wellington at a provincial level, and was a member of the first ever New Zealand national side, which toured Australia and won every game, in 1884. He played eight matches on the tour. He did not play any full test matches as New Zealand did not play their first until 1903. He was the Wellington selector from 1884 to 1885.[2]
A cousin, Dan Udy, represented New Zealand in 1901 and 1903.