Arthur Walsh (February 26, 1896 – December 13, 1947) was an American civil servant, businessman, soldier and World War I veteran, who served as the junior United States senator from New Jersey from November 26, 1943 to December 7, 1944.

From 1917 to 1919 he served as a sergeant in the United States Marine Corps, participating in World War I.

He later served as a lieutenant in the United States Naval Reserve from 1929 to 1932, and had the rank of colonel in the New Jersey National Guard from 1941 to 1943.

A member of the New Jersey Workmen's Compensation Investigating Commission from 1932 to 1933, he served as New Jersey Director of the Federal Housing Administration from 1934 to 1935, and as Deputy and later as Assistant Administrator at the Washington, D.C. head office from 1935 to 1938.

He became commissioner of the Port of New York Authority in 1943 but was appointed on November 26, 1943 as a Democrat to the United States Senate to fill the vacancy caused by the death of William Warren Barbour and served until December 7, 1944, when a duly elected successor qualified.