Iwatsuki, Saitama

 was a city located within Saitama Prefecture, Japan.
As of 2003, the city had an estimated population of 109,580 and the density of 2,229.05 persons per km². The total area was 49.16 km².
On April 1, 2005, Iwatsuki was merged into the expanded city of Saitama, effectively the former city becomes Iwatsuki-ku.
The city was founded on July 1, 1954 by turning in South Saitama District into a district-independent city.