John M. Williams (1935–2021) was an American football coach.
John M. Williams may also refer to:
- John M. Williams Jr. (born 1977), Canadian football player
- John McKay Williams (1945–2012), American football player
- John McLaughlin Williams (born 1957), American conductor and violinist
See also
- John Williams (disambiguation)
- Johnny Madison Williams Jr. (born 1951), American bank robber
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