Brynhild Synstnes (born 20 April 1971) is a retired Norwegian long-distance runner who specialized in 3000/5000 metres and later marathon.
In addition she was on the Norwegian team who won the silver medal at the 1994 IAAF World Half Marathon Championships, having finished seventh in the individual race.
She competed again at the 1995 IAAF World Half Marathon Championships, but only finished 49th.
The same year she competed in 5000 metres at the World Championships without reaching the final.
This biographical article relating to Norwegian athletics is a stub.