Nishi-ku (西区, Nishi-ku) is one of ten wards of the city of Saitama, in Saitama Prefecture, Japan, and is located in the far western part of the city. As of 1 March 2021, the ward had an estimated population of 93,527 and a population density of 3200 persons per km². Its total area was 29.14 square kilometres (11.25 sq mi).

Nishi-ward is located in the extreme western side of the city of Saitama.

Saitama Prefecture:

• Ageo
• Kawagoe
• Fujimi
• Kita-ku
• Ōmiya-ku
• Sakura-ku

The villages of Sashiougi, Mamiya, Uemizu, Nisshin and Mihashi were created within Kitaadachi District, Saitama with the establishment of the municipalities system on April 1, 1889. Nisshin and Mihashi were merged with Ōmiya Town in 1940, becoming part of the city of Ōmiya. In 1955, Ōmiya annexed Sashiougi, Mamiya, and Uemizu. On May 1, 2001, Ōmiya merged with Urawa and Yono cities to form the new city of Saitama. When Saitama was proclaimed a designated city in 2003, the far western portion of former Ōmiya city became Nishi Ward.

Nishi-ku has eight elementary schools, six junior high schools, four high schools and one special education school.

Public junior high schools:

Municipal elementary schools:

JR East – Kawagoe Line

• Nishi-Ōmiya - Sashiōgi

• National Route 16
• National Route 17

Media related to Nishi-ku, Saitama at Wikimedia Commons

• Official website (in Japanese)