John J. McKeown (5 February 1926 – 5 September 2006), also known by the nicknames of "J.J.", and "Mac", was an English professional rugby league footballer who played in the 1940s, 1950s and 1960s. He played at representative level for Great Britain and Cumberland, and at club level for Whitehaven, as a left-footed toe-end style (rather than round the corner style) goal-kicking fullback, i.e. number 1.