William Frederick Waldow (August 26, 1882 – April 16, 1930) was a United States representative from New York. Born in Buffalo, he attended the common schools, apprenticed as a plumber, and later engaged as a plumbing contractor. He was elected a member of the board of aldermen of Buffalo in 1912 and 1913 and was a member of the New York Republican State committee in 1916.
Waldow was elected as a Republican to the Sixty-fifth Congress, holding office from March 4, 1917, to March 3, 1919. He was unsuccessful for reelection in 1918 to the Sixty-sixth Congress and resumed former business pursuits. He was a delegate to the Republican National Convention in 1920 and was sheriff of Erie County from 1921 to 1923. He died in Snyder (a suburb of Buffalo) in 1930; interment was in Forest Lawn Cemetery.
