The Nanokaichi Domain (七日市藩 Nanokaichi-han) was a Japanese feudal domain of the Edo period, located in Kōzuke Province (in the modern-day city of Tomioka, Gunma Prefecture). The domain had its headquarters in a jin'ya rather than a castle. Parts still stand on the original site (now a high school) and some other structures have been moved. Nanokaichi was ruled by a branch of the Maeda clan of Kaga.