Mary A. Gillen (October 8, 1894 – September 14, 1963) was an American politician from New York.
Her husband was a member of the New York State Assembly (Kings Co., 3rd D.) from 1926 until his death on February 1, 1942.
On February 16, she was nominated to run at a special election to fill the vacancy caused by her husband's death.
In November 1956, she ran for re-election but was defeated by Republican Harry J. Donnelly.
She died on September 14, 1963, in St. Mary's Hospital in Brooklyn;[3] and was buried at the Holy Cross Cemetery there.