Donald Alexander Paterson (November 25, 1926 – January 11, 1999) was a politician in Ontario, Canada.
He was a Liberal member of the Legislative Assembly of Ontario from 1963 to 1975 who represented the southwestern riding of Essex South.
He owned and managed Paterson's Dry Goods in the town of Leamington.
Paterson died in 1999 and is buried in Erie Memorial Gardens, Leamington, Essex Co., Ontario.
He served in the opposition benches under leaders Andy Thompson and Robert Nixon.