Tōki Susumu (born July 4, 1974 as Jun Tamaki) is a former sumo wrestler from Ichikawa, Chiba Prefecture, Japan.

In 1998 Tōki managed to enter the top makuuchi division for the first time and quickly became a regular maegashira, although his results were not sufficient to make him a san'yaku wrestler (although he was a komusubi for one tournament in September 2003, he could not retain this rank).

He suffered increasingly from back problems related to spinal stenosis, which was the reason why he missed six days of the January 2006 tournament.

After a disastrous make-koshi in March, Tōki was demoted to makushita in May 2006 and announced his retirement on the day the tournament started.

Tōki relied almost exclusively on slapping and pushing techniques, making his style very predictable, yet often surprisingly successful.

[4] Sanshō key: F=Fighting spirit; O=Outstanding performance; T=Technique     Also shown: ★=Kinboshi; P=Playoff(s) Divisions: Makuuchi — Jūryō — Makushita — Sandanme — Jonidan — Jonokuchi