Ōdayama Park, Urban park in Kisarazu, Japan.

Ōdayama Park is a 97,000 m² urban park in Kisarazu centred on Mount Ōda, a 44 m hill visible from the east exit of Kisarazu Station. At the summit stands the sword-shaped Kimisarazu Tower. The grounds hold the Kisarazu City Museum "Kane no Suzu", the relocated former Anzai family farmhouse, Tachibana Shrine, a field athletics course and walking trails.

The hill was a military site in World War II, when the Japanese army dug tunnels and underground shelters and set up anti-aircraft gun positions; city authorities still lack full details of that period. The Kintrei festival began on the hill in 1953, the urban park plan was decided in 1969 and completed in 1978, and the former Anzai house was moved into the park in 1982.

The former Anzai family residence displays authentic Edo-period farmhouse architecture and reveals how rural families organized their daily lives. The layout of rooms and work spaces shows traditional Japanese living practices from centuries past.

The park is a 15-minute walk from the east exit of Kisarazu Station on the JR Uchibo and Kururi lines, or a 5-minute walk from the "Koi no Mori" bus stop on the Nitto Kotsu Oda loop bus. A free car park holds 68 vehicles. The grounds cover 97,000 square metres around a 44-metre hill.

The summit of Mount Ōda, 44 m high, is said in tradition to have held a burial mound, though none survives today. The sword-shaped Kimisarazu Tower now stands there, and the name recalls Yamato Takeru's stay, from which "Kimi-sarazu" ("my lord does not leave") became Kisarazu.