William Ross (died September 5, 1830) was an American lawyer and politician.
He was the son of Robert Ross, a Scottish tanner who settled at Rossville, a hamlet in Newburgh, New York.
William Ross studied law and gained admission to the bar in 1801, and practiced at Newburgh, New York.
He married first Mary S. McLean (1787–1812), and then Caroline Middlebrook of Connecticut.
He was a member from Orange County of the New York State Assembly in 1808, 1809, and from 1811 to 1814.