William M. Whitney (1828 – in or after 1908) was an American politician and real estate developer from upstate New York.
Whitney was elected to the Illinois House of Representatives in 1870 and served one two-year term.
Six years later, the seat was moved to Wheaton, which may have caused Whitney to not seek re-election in his role.
After his term expired, Whitney returned to his home in Hinsdale, where he pushed for incorporation.
By 1879, Whitney was deeply in debt and sold his house to pay back taxes.
In 1879, he took a position managing accounts for the Illinois Eastern Hospital for the Insane, where he worked for eight years.