Yokohama National University , abbreviated to Yokohama Kokudai (横浜国大), Yokokoku (横国) or YNU, is a national university located in Yokohama, Kanagawa Prefecture, Japan. Founded in 1876, it became a national university in 1949, and currently comprises five graduate schools and four undergraduate faculties.

Yokohama is the second-largest city in Japan by population and by area, and the country's most populous municipality. It is the capital and most populous city in Kanagawa Prefecture, with a population of 3.7 million in 2023. It lies on Tokyo Bay, south of Tokyo, in the Kantō region of the main island of Honshu. Yokohama is also the major economic, cultural, and commercial hub of the Greater Tokyo Area along the Keihin Industrial Zone.