The Ōmoto Kofun Cluster (大元古墳群, Ōmoto Kofun-gun) is a group of Kofun period burial mounds located on the Toda-chō neighborhood of the city of Masuda, Shimane Prefecture in the San'in region of Japan.

[1] The Ōmoto Kofun cluster is located on a hilly ridge to the east of Masuda city in the western part of Shimane Prefecture.

A survey was conducted from 1986 to 1988 and an archaeological excavation from 2015, confirming that the cluster consists of three ancient tumuli.

It is orientated to the southwest and there is a ceremonial platform protruding from the north side of the mound.

The site is located approximately ten minutes by car from Masuda Station JR West San'in Main Line.