Hiroki Kotani (born July 11, 1971) is a Japanese mixed martial artist. He competed in the Lightweight division.
|- | Loss | align=center| | Masashi Takeda | KO (punch) | Zst: Zst 12 | | align=center| 1 | align=center| 1:28 | Tokyo, Japan | |- | Win | align=center| 3âÂÂ11âÂÂ4 | Anton Kuivanen | Submission (heel hook) | Zst: Prestige | | align=center| 1 | align=center| 1:17 | Turku, Finland | |- | Loss | align=center| 2âÂÂ11âÂÂ4 | Jon Friedland | KO (punch) | XFO: Xtreme Fighting Organization 8 | | align=center| 1 | align=center| 2:33 | Lakemoor, Illinois, United States | |- | Loss | align=center| 2âÂÂ10âÂÂ4 | Alex Gasson | Decision (unanimous) | XFO 4: International | | align=center| 3 | align=center| 5:00 | Lakemoor, Illinois, United States | |- | Loss | align=center| 2âÂÂ9âÂÂ4 | Edson Diniz | Submission (armbar) | AFC 7: Absolute Fighting Championships 7 | | align=center| 1 | align=center| 3:01 | Fort Lauderdale, Florida, United States | |- | Draw | align=center| 2âÂÂ8âÂÂ4 | Rich Clementi | Draw | Zst: The Battlefield 4 | | align=center| 3 | align=center| 5:00 | Tokyo, Japan | |- | Loss | align=center| 2âÂÂ8âÂÂ3 | Mitsuo Matsumoto | Decision (majority) | | | align=center| 2 | align=center| 5:00 | Setagaya, Tokyo, Japan | |- | Loss | align=center| 2âÂÂ7âÂÂ3 | Takayuki Okochi | KO (knee) | | | align=center| 1 | align=center| 2:06 | Setagaya, Tokyo, Japan | |- | Draw | align=center| 2âÂÂ6âÂÂ3 | Seiki Uchimura | Draw | | | align=center| 2 | align=center| 5:00 | Tokyo, Japan | |- | Loss | align=center| 2âÂÂ6âÂÂ2 | Mitsuhiro Ishida | Decision (unanimous) | | | align=center| 2 | align=center| 5:00 | Tokyo, Japan | |- | Win | align=center| 2âÂÂ5âÂÂ2 | Takashi Ochi | Decision (unanimous) | | | align=center| 2 | align=center| 5:00 | Setagaya, Tokyo, Japan | |- | Draw | align=center| 1âÂÂ5âÂÂ2 | Takeshi Yamazaki | Draw | | | align=center| 2 | align=center| 5:00 | Setagaya, Tokyo, Japan | |- | Draw | align=center| 1âÂÂ5âÂÂ1 | Mitsuo Matsumoto | Draw | | | align=center| 2 | align=center| 5:00 | Setagaya, Tokyo, Japan | |- | Loss | align=center| 1âÂÂ5 | Tetsuharu Ikei | KO (punch) | | | align=center| 1 | align=center| 0:35 | Setagaya, Tokyo, Japan | |- | Loss | align=center| 1âÂÂ4 | Dokonjonosuke Mishima | Submission (rear-naked choke) | | | align=center| 1 | align=center| 4:00 | Setagaya, Tokyo, Japan | |- | Loss | align=center| 1âÂÂ3 | Kazumichi Takada | Decision (majority) | | | align=center| 2 | align=center| 5:00 | Tokyo, Japan | |- | Loss | align=center| 1âÂÂ2 | Takenori Ito | Decision (unanimous) | | | align=center| 2 | align=center| 5:00 | Tokyo, Japan | |- | Loss | align=center| 1âÂÂ1 | Caol Uno | Decision (unanimous) | Lumax Cup: Tournament of J '97 Lightweight Tournament | | align=center| 2 | align=center| 3:00 | Japan | |- | Win | align=center| 1âÂÂ0 | Naoto Kojima | Submission (heel hook) | Lumax Cup: Tournament of J '97 Lightweight Tournament | | align=center| 1 | align=center| 1:10 | Japan |