Hitachi-Fuchū Domain (常陸府中藩, Hitachi-Fuchū han) was a feudal domain under the Tokugawa shogunate of Edo period Japan, located in Hitachi Province (modern-day Ibaraki Prefecture), Japan.

It was centered on Fuchū Jin'ya in what is now the city of Ishioka, Ibaraki.

It was also known as Ishioka Domain (石岡藩, Ishioka han) or Naganuma Domain (長沼藩, Naganuma han) The domain was created in 1602, when Rokugō Masanori, the head of the Rokugō clan, a prominent family of Dewa Province, was awarded a 10,000 koku holding in Hitachi-Fuchū for serviced rendered to Tokugawa Ieyasu during the Battle of Sekigahara.

The Matsudaira continued to rule the domain until the Meiji restoration.

As with most domains in the han system, Hitachi-Fuchū Domain consisted of several discontinuous territories calculated to provide the assigned kokudaka, based on periodic cadastral surveys and projected agricultural yields.