Yahagi (やはぎ) is a frigate of the Japan Maritime Self-Defense Force, and the fifth ship of the Mogami class.

Her namesake comes from the Yahagi River, which flows through Nagano, Gifu, and Aichi prefectures,[1] a name that was chosen by Defense Minister Nobuo Kishi after a competition within the Maritime Self-Defense Forces.

Yahagi was ordered in the fiscal year 2020, based on the Mid-Term Defense Program, with her keel being laid down at Mitsubishi Heavy Industries Nagasaki Shipyard on 24 June 2021,[2] and was launched on 23 June 2022.

[1] After undergoing fitting out and sea trials, the ship was commissioned on 21 May 2024,[3][a] assigned to the Escort Fleet 14th Escort Division of Maizuru.

[5][better source needed] The Mogami-class frigates were designed to be multi-functional in various roles, to address the growing peacetime surveillance and monitoring activities around Japan, including anti-submarine, anti-aircraft, surface, and mine warfares.