William Herman Ferrier (born November 8, 1932) was a Canadian politician.
Following the death of his wife, Jean in 2002, Ferrier was remarried in 2005 to Ruth Margaret Mahady and currently lives in London, Ontario.
A well-liked and respected member of the Ontario Legislature, Ferrier served on committees that dealt with Election Law and Finance, Agricultural Land Drainage and Automobile Safety.
He subsequently ran as a federal New Democratic candidate in Timmins—Chapleau in the 1980 election, but lost to incumbent MP Ray Chénier.
Ferrier was a long time trustee on the former Timmins Board of Education serving from 1978 until his retirement from the position in 1995.