Nishi-ku (西区) is one of the seven wards of Fukuoka City, Japan. Meaning literally "west ward," it is bordered to the east by Sawara-ku, and to the west by Itoshima. As of 2003, it has a population of 173,813 people and an area of 83.81 km2. As of 2016, its population had increased to 206,000 people. It has recently gained additional infrastructure in the form of the Nanakuma Line, in addition to the Fukuoka City Subway and the Chikuhi Line.