Nishi-ku (西区, Nishi-ku) is one of seven wards of Hamamatsu, Shizuoka, Japan, located in the southwest corner of the city. It is bordered by Naka-ku, Kita-ku, Minami-ku, and the city of Kosai. The 3rd largest ward of Hamamatsu in terms of area, much of the ward is still rural, with farms and rice fields.

Nishi 西区
Ward
Nishi Ward
Lake Hamana and Hamanako Road Bridge
Location of Nishi-ku in Shizuoka
Nishi
Coordinates: 34°41′33.77″N 137°38′43.2″E / 34.6927139°N 137.645333°E / 34.6927139; 137.645333Coordinates: 34°41′33.77″N 137°38′43.2″E / 34.6927139°N 137.645333°E / 34.6927139; 137.645333
Country	Japan
Region	Chūbu
Prefecture	Shizuoka
City	Hamamatsu
Area
• Total	114.71 km2 (44.29 sq mi)
Population  (December 1, 2019)
• Total	108,501
• Density	950/km2 (2,400/sq mi)
Time zone	UTC+9 (Japan Standard Time)
Phone number	053-597-1111
Address	1-31-1 Yūtō, Nishi-ku, Hamamatsu, Shizuoka 431-0193
Website	Nishi-ku home page

Nishi-ku was created on April 1, 2007 when Hamamatsu became a city designated by government ordinance (a "designated city").

Nishi-ku is served by Maisaka Station and Bentenjima Station on the Tōkaidō Main Line railway.

Nishi Ward Office, Hamamatsu