The Fortress site of Gyeongsang Jwasuyeong (Korean: 경상좌수영성지) is located in Suyeong-dong, Suyeong district, Busan, South Korea.

At one time, seven naval ports with a total of 65 battle ships and 40 auxiliary vessels were under its command and charged with the defense of the east coast area.

The command post was first located at Busanpo, then relocated at Gaeunpo at Ulsan, and immediately before the Japanese Invasions of 1592, was moved to this place.

Thereafter, it remained at this site, until the naval forces were disbanded in the overall reformation of the military systems in 1895.

Most of the facilities have been ruined due to the lack of proper care during the colonial period(1910–45) and there remain only parts of the wall, the arched south gate, and drain-outlets.