The Watanuke Kannonyama Kofun (綿貫観音山古墳) is a Kofun period burial mound located in the Watanuki neighborhood of the city of Takasaki, Gunma Prefecture in the northern Kantō region of Japan. The site was designated a National Historic Site of Japan in 1973. The site dates from the late 6th Century, and many of the grave goods discovered during archaeological excavation were designated National Important Cultural Properties in 1994 In the year 2020, the collective status of 3346 artifacts from the tomb was raised to that of a National Treasure.