William M. Steinfeldt (March 22, 1917 – September 4, 2006) was an American engineer and politician from New York.
He was born on March 22, 1917, in Rochester, New York.
On April 20, 1982, he was elected to the New York State Senate, to fill the vacancy caused by the appointment of Fred J. Eckert as U.S.
Steinfeldt was re-elected in November 1982, and remained in the State Senate until 1984, sitting in the 184th and 185th New York State Legislatures.
in November 1984, he ran for re-election, but was defeated by Democrat Ralph E. Quattrociocchi.