The Battle of Ozawahara () was fought in 1530 in the present day Asao, Kawasaki, Kanagawa. This was the first battle for Hà Âjà  Ujiyasu, then sixteen years old.
Ujiyasu faced Uesugi Tomooki at Ozawahara in Musashi Province. The battle was part of a seventeen-year struggle between the Hà Âjà  clan and the Uesugi clan for control of the Kantà  region which began with the 1524 Siege of Edo. The battle ended with a Hà Âjà  victory.