Iwatsuki-ku(岩槻区,Iwatsuki-ku) is one of ten wards of the city of Saitama, in Saitama Prefecture, Japan, and is located in the northeastern part of the city. As of 1 February 2016, the ward had an estimated population of 109,901 and a population density of 2,240 persons per km². Its total area was 49.17 square kilometres (18.98 sq mi).