Yokohama International School (横浜インターナショナルスクール) is a prestigious, co-educational international school located in Naka-ku, Yokohama, Japan.

Naka-ku (中区) is one of the 18 wards of the city of Yokohama in Kanagawa Prefecture, Japan. In 2010, the ward had an estimated population of 146,563 and a population density of 7,080 persons per km². The total area was 20.86 km².