Coordinates: 35°34′00″N 139°44′00″E / 35.566667°N 139.733333°E / 35.566667; 139.733333

Ōmori (大森^?) is a district located a few kilometres south of Shinagawa, Tokyo, Japan accessed by rail via the Keihin Tohoku line, or by road via Dai Ichi Keihin. Ōmorikaigan, the eastern area of Ōmori, can be reached via the Keikyu line.

Ōmori is one of many areas in Tokyo's largest ward, Ota-ku, and was formerly home to the German International School before its relocation to Yokohama. The quality residential and retail developments that the German school attracted are obvious in the Ōmori-sannō area. Ōmori is home to the headquarters of the automotive company Isuzu, which has offices in the Belport complex a few hundred metres from Ōmori station.

Prior to its development as a convenient residential and business location, Ōmori was laced with a network of small rivers which were used by many locals for drying harvested nori (seaweed), a staple of the Japanese diet. Modern Ōmori is built on mostly reclaimed land, and is very much a traditional Shinto area; there are many shrines in the area, and during the August o-bon festival, mikoshi parades are very common.

Kazuki Ōmori (大森 一樹, Ōmori Kazuki^?, born March 3, 1952) is a Japanese film director and screenwriter.

Born in Osaka, Ōmori studied at Kyoto Prefectural University of Medicine and actually holds a license to practice medicine. While in school, he began making films independently, with Kuraku naru made matenai! (1975), which featured Seijun Suzuki, receiving particularly high praise. His script "Orenji rōdo kyūkō" won the 3rd Kido Award for screenplays in 1977, and the next year he was able to film that in his professional debut. Several of his films, such as the 1980 Hipokuratesu-tachi, feature doctors or rely on his knowledge of medicine. He has worked in a variety of genres, including suspense films, musicals, and most famously abroad, several contributions to the Heisei Godzilla series.

Ōmori also participated in the formation of Director's Company in 1982, an independent production company founded by nine directors, including Kiyoshi Kurosawa, Sōgo Ishii, Shinji Sōmai, and Kazuhiko Hasegawa. In 2000, he became a professor at Osaka Electro-Communication University, and in 2005, a professor at Osaka University of Arts. He was also a special guest at G-Fest XIII in 2006.