市原市
was a feudal domain under the Tokugawa shogunate of the Edo period, located in, Kazusa Province (modern-day Chiba Prefecture), Japan. The domain was centered on what is now the city of Ichihara, Chiba. It was ruled for the entirety of its history by a branch of the Arima clan. The site of the Goi Domain "jin'ya" is now Goi Station on the JR-East Uchibō Line.