Platt Whitman (February 6, 1871 – September 11, 1935) was a member of the Wisconsin State Assembly and the Wisconsin State Senate.
Whitman was born in Dodgeville, Wisconsin. He graduated from the University of Wisconsin-Madison in 1893 and the University of Wisconsin Law School in 1895.
He died in Rochester, Minnesota on September 11, 1935, and is interred in the East Side Cemetery in Dodgeville near the Jones-Owens Mausoleum.
His father was Joel Whitman.
Whitman was elected to the Assembly in 1908. Later, he was a member of the Senate from the 17th district from 1915 to 1918. He was a Republican.