Mihama Ward is one of the six wards of the city of Chiba in Chiba Prefecture, Japan. As of April 2012, the ward had an estimated population of 149,314 and a population density of 7,060 persons per km2. The total area was 21.16 km2.

Chiba is the capital city of Chiba Prefecture, Japan. It sits about 40 kilometres (25 mi) east of the centre of Tokyo on Tokyo Bay. The city became a government-designated city in 1992. In June 2019, its population was 979,768, with a population density of 3,605 people per km2. The city has an area of 271.77 square kilometres (104.93 sq mi).