Japanese cruiser Yahagi may refer to one of the following cruisers of the Imperial Japanese Navy:
- Japanese cruiser Yahagi (1911), a Chikuma-class cruiser; participated in World War I; demilitarized in 1940 and used as barracks ship Hai Kan No. 12 during World War II; scrapped in 1947
- Japanese cruiser Yahagi (1942), an Agano-class cruiser; participated in World War II; sunk by U.S. carrier-based aircraft April 7, 1945 during Operation Ten-Go