William Parmenter (March 30, 1789 – February 25, 1866) was a United States Representative from Massachusetts.
He was born in Boston on March 30, 1789.
He attended the city's public schools, including the Boston Latin School.
He was a member of the Massachusetts House of Representatives in 1829, served in the Massachusetts State Senate in 1836 and was a Cambridge selectman in 1836.
He was manager and agent of the New England Crown Glass Co., and president of the Middlesex Bank.
Parmenter was elected as a Democrat to the Twenty-fifth and to the three succeeding Congresses (March 4, 1837 – March 3, 1845), serving as chairman of the Committee on Naval Affairs in the (Twenty-eighth Congress).
He also served as a naval officer at the port of Boston 1845–1849.
He died in East Cambridge, Massachusetts on February 25, 1866.