Guy Louis Moser (January 23, 1886 – May 9, 1961) was a Democratic member of the U.S. House of Representatives from Pennsylvania.

Guy L. Moser was born on a farm in Amity Township, Berks County, Pennsylvania.

Moser was elected as a Democrat to the Seventy-fifth, Seventy-sixth, and Seventy-seventh Congresses.

He served as Chairman of the United States House Committee on the Census during the Seventy-seventh Congress.

After his time in Congress he resumed agricultural pursuits and also engaged in public speaking.