Raijinyama Kofun (雷神山古墳) is a kofun burial mound located approximately two kilometers south of the center of the city of Natori, Miyagi in the Tōhoku region of northern Japan.

[1] The Raijinyama kofun is the largest keyhole-shaped kofun (前方後円墳, zenpō-kōen-fun) in the Tōhoku region and is located at the top of Natori hill where many large tumuli are concentrated, overlooking the Sendai Plain.

It was built in steps, partially by utilizing the contours of a natural hill, and was once covered in fukiishi.

It has only been partially excavated; however, From the style of the mound and the pot-shaped haniwa and Sue ware pottery fragments discovered at the site, archaeologists have dated the kofun to the late 4th or early 5th century AD.

It is about a 30-minute walk from Tatekoshi Station on the JR East Tōhoku Main Line.