The Katori Shrine is a Shinto shrine in the city of Katori in Chiba Prefecture. It is the head shrine of the approximately 400 Katori shrines around the country.
The primary god of Katori Shrine is Futsunushi, the god of swords and lightning.

The foundation of Katori Shrine predates the historical period. Per the Hitachi Fudoki, an ancient record and per shrine tradition, it was established in 643 BC, the 18th year of the reign of Emperor Jimmu. During this period, the Oh clan imigrated from Higo Province in Kyushu, conquering local Emishi tribes, and forming an alliance with the nearby Nakatomi clan, the progenitors of the Fujiwara clan at what is now Kashima Shrine.

In the mid-Heian period Engishiki records, it is ranked alongside Ise Grand Shrine and Kashima Shrine as one of three shrines with the shrine designation.