| Jack Best | |
| Birth Name: | John Jeffries Best |
| Birth Date: | 19 March 1914 |
| Birth Place: | Blenheim, New Zealand |
| Death Place: | Blenheim, New Zealand |
| Ru Position: | Loose forward |
| Height: | 1.830NaN0 |
| Weight: | 92kg (203lb) |
| Repyears1: | 1935–36 |
| Repcaps1: | (0) |
| Reppoints1: | 0 |
| Provinceyears3: | 1938–39 |
| Occupation: | Farmer[1] |
| School: | St Patrick's College, Silverstream |
John Jeffries Best (19 March 1914 – 25 May 1994) was a New Zealand rugby union player. A loose forward, Best represented,, and at a provincial level. He was a member of the New Zealand national side, the All Blacks, on their 1935–36 tour of the British Isles and Canada but broke his collarbone in his first game and only played in six matches on the tour, and did not appear in any of the test matches.[2]
Best died in Blenheim on 25 May 1994,[2] and was buried at Fairhall Cemetery.[1]