常总市（日语：常総市／じょうそうし）是位于茨城县西南部的一市。设立于2006年1月1日，由水海道市与石下町编入合并诞生，同时改名。

Jōsō(常総市,Jōsō-shi) is a city located in Ibaraki Prefecture, in the northern Kantō region of Japan. As of September 2015, the city had an estimated population of 62,686 and a population density of 507 persons per km². Its total area was 123.64 square kilometres (47.74 sq mi). The city has a large expatriate population from Brazil, and many of the city signs are in both Japanese and Portuguese.