Walter Aloysius Lynch (July 7, 1894 – September 10, 1957) was an American lawyer and politician from New York.

He was first elected to the 76th United States Congress in a special election to fill the vacancy caused by the death of Edward W. Curley, and was re-elected to the 77th, 78th, 79th, 80th, and 81st U.S. Congresses, in total serving from February 20, 1940, to January 3, 1951.

In 1950, Lynch was the Democratic nominee for governor of New York, but was defeated in a landslide by incumbent Thomas E. Dewey.

Lynch was elected to the New York Supreme Court in 1954, and served from January 1955 until his death.

Lynch died at his summer home in Belle Harbor, Queens.