Tomohiro Ōmachi, also known as Tomohiro Oomachi or Tomohiro Ohmachi, is a Japanese voice actor born on December 11. While one source lists his birthplace as Tokyo, others indicate he is from Osaka Prefecture. He is affiliated with the talent agency With Line. His blood type is AB.

Ōmachi is known for his role as the dual character Ichihoshi Mitsuru and Ichihoshi Hikaru in the 2018 anime series Inazuma Eleven: Orion no Kokuin. This series, part of the long-running Inazuma Eleven franchise, features a national team called Inazuma Japan competing in an international tournament. In the show, Ichihoshi Mitsuru is a mysterious player who joins the team from Russia, and his character has a significant and complex role in the storyline.

Beyond this prominent role, Ōmachi has built a career with numerous supporting and guest roles in anime television series. His filmography includes parts in a wide variety of shows across different genres. Some of these roles include Takeru Tsunoyama in Rokudo's Bad Girls, Genri Sayo in Beyblade X, the Thief in Berserk of Gluttony, and a Griffin Support Unit Staff Member in Girls' Frontline. He has also had smaller roles in popular series such as Attack on Titan, Sword Art Online, My Hero Academia, and Chihayafuru. More recent credits include appearances in Aharen-san wa Hakarenai, A Galaxy Next Door, and mono.