Ōmorimachi Station (大森町駅, Ōmorimachi-eki) is a railway station in the Ōmori section of Ōta, Tokyo, Japan.

The station has two side platforms serving two tracks.

Both platforms are on the upper level and connected by stairs, escalators and elevators to the ground level where ticket office, gates and toilets are located.

The location was where Ōmori-San'ya Station (大森山谷駅) (originally San'ya Station) existed from 1906 to the unknown date during the World War II (official closure following the suspension was in 1949).

Prior to the move to this location, San'ya Station was on a nearby street from 1901.