Nanokaichi Domain (七日市藩 Nanokaichi-han) was a feudal domain under the Tokugawa shogunate of Edo period Japan, located in Kōzuke Province (modern-day Gunma Prefecture), Japan. It was centered on Nanokaichi jin'ya in what is now part of the city of Tomioka, Gunma. Parts of the jin'ya, including the daimyo residence and gardens are preserved on the original site (now part of Tomioka High School). Nanokaichi was ruled throughout its history by a junior branch of the Maeda clan of Kaga.