Nishi-ku (西区) is one of the five wards of Kumamoto City, Japan. Meaning literally "west ward," it is bordered by the Kita-ku, Chūō-ku, Minami-ku and also by the city of Tamana and the town of Gyokutō. As of 2012, it has a population of 93,394 people and an area of 88.21 km2.