Tatsumi (辰巳) is an area of Koto, Tokyo, Japan.
It is surrounded by water on all sides, but is joined by bridges to Shiomi to the north, Shin-Kiba and Yumenoshima to the east, and Shinonome to the west.
The name "Tatsumi" means "South East", and is taken from the area's direction from the Tokyo Imperial Palace.
The swimming events for the 2020 Summer Olympics will be held in Tatsumi at the Tokyo Tatsumi International Swimming Center.
[1] Koto Ward Board of Education operates public elementary and junior high schools.