Takafumi Otsuka Japanese: 大塚隆史 (born August 22, 1986) is a Japanese mixed martial artist. He competed in the bantamweight, featherweight and lightweight division. A professional mixed martial artist since 2006, Otsuka is a two-time DEEP Bantamweight Champion and a one-time DEEP Featherweight Champion.

Otsuka made his professional MMA debut in October 2006 and lost the bout via submission in the second round.

Although Otsuka fought for various promotions over the first ten years of his career, he primarily competed for the Deep promotion in Japan with over 25 bouts held there.

Otsuka challenged Dokonjonosuke Mishima for the DEEP Featherweight Championship at Deep: 43 Impact on August 23, 2009. He won the fight and claimed the title via unanimous decision.

Otsuka made his first title defense attempt against Yoshiro Maeda at Deep 57: Impact on February 18, 2012. However, he lost the title via second-round submission.

In April 2014, Otsuka faced Kenji Osawa for the vacant DEEP Bantamweight Championship at Deep: 66 Impact. He won the bout and title via unanimous decision.

In July 2017, Otsuka made his debut for Rizin Fighting Federation. He faced Anthony Birchak in the first round of the Rizin Bantamweight Grand Prix on July 30, 2017 at Rizin 6 and won the fight via split decision.

Otsuka made his promotional debut in Shooto against Tatsuya Ando at Shooto 1123 on November 23, 2020. He won the fight via technical knockout after Ando injured his knee.