Yotsuya is an area located in the Shinjuku ward of Tokyo, Japan. It previously functioned as an independent ward within the now-defunct Tokyo City.
The current boundaries of Yotsuya were established in 1947 during a major reorganization of the city's administrative structure. At this time, it was merged with Ushigome ward of Tokyo City and Yodobashi suburban ward of Tokyo-fu to form the modern Shinjuku ward.