| Birth Place: | Napier, New Zealand |
| Height: | 1.87m (06.14feet) |
| Weight: | 750NaN0 |
| Country: | New Zealand |
| Sport: | Middle-distance running |
| Club: | Napier |
| Retired: | 2008 |
| Pb: | 800m 1:46.19 (Huesden-Zolder, 2005) |
| Highestranking: | 31 (2005) |
| Show-Medals: | no |
Jason Stewart (born 21 November 1981) is a former New Zealand middle-distance runner.
Stewart is the former national record holder in the 800m for the u/18 (1.51.49) and u/20 (1.48.73) age group categories.
In 2000 he finished 7th over 800m at the IAAF World Junior Athletics Championship in Santiago, Chile.
In addition to 2 National titles over 800m (2002,2006), Stewart represented New Zealand in the 2004 Olympic Games in Athens, the 2005 World Championships in Helsinki, the 2006 Commonwealth Games in Melbourne (5th place) and represented the Oceania region at the 2006 IAAF World Cup of Athletics in Athens (8th place) .
He achieved a career-best IAAF world ranking of 31 for the 800 metres in 2005