The Battle of Dong-Yin (Chinese: 東引海戰) was a naval conflict between forces of the Republic of China Navy and the People's Liberation Army Navy around Dongyin island, Fukien Province, Republic of China on 1 May 1965. Both sides subsequently claimed victory.

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Battle of Dong-Yin
Part of the Cross-Strait conflict
Dongyin, Lienchiang in the East China Sea (labelled as Tung-yin Shan 東引山) (1953
Date 1 May 1965 Location Dongyin Island, Lienchiang County (the Matsu Islands), Fukien, Republic of China (Taiwan) 26.378°N 120.507°E / 26.378; 120.507 Result Both sides claimed victory
Belligerents
Republic of China	People's Republic of China
Commanders and leaders
Ho Ten Song	Unknown
Units involved
Republic of China Navy	People's Liberation Army Navy
Strength
1 destroyer	8 gunboats
Casualties and losses
Official claim: 3 killed 4 wounded Estimate: 7 killed 43 wounded	4 boats sunk 2 boats damaged

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Around 12:40 AM on May 1, 1965, a ROCN Northern Division Dong-jiang a PC (patrol craft) on patrol northeast of Dong-Yin Island encountered a PLAN force consisting of 8 fast attack gunboats. The PLAN combatants attempted to encircle the ROCN destroyer, and the two sides exchanged fire from a distance of 500 to 1,000 yards. In the ensuing exchange, 4 PLAN gunboats were sunk, and 2 damaged.