Keith Ostrander MacDonald[1] (July 18, 1927 – March 27, 2021) was a politician in Ontario, Canada.
MacDonald was educated at Albert College in Belleville, Ontario, and worked as a businessman, farmer and tourist operator.
He first ran for the Ontario legislature in the 1975 provincial election, but lost to Progressive Conservative James Taylor by 732 votes in the riding of Prince Edward—Lennox.
He ran again in the 1987 election, and defeated Progressive Conservative candidate Dennis Tompkins by 2,079 votes.
For the next three years, MacDonald served as a backbench supporter of David Peterson's government.