Ryan Johnston (born February 14, 1992) is a Canadian professional ice hockey defenceman currently playing for the Iserlohn Roosters of the Deutsche Eishockey Liga (DEL). He has previously played in the National Hockey League (NHL) with the Montreal Canadiens.
Born in Sudbury, Ontario, Johnston played three years of college hockey with the Colgate Raiders. In the summer of 2015, he signed a two-year two-way deal with the Canadiens and played the 2015–16 with Montreal's AHL affiliate, the St. John's IceCaps. After a string of injuries to Canadiens' defenceman, Johnston was called up and played his first NHL game on April 5, 2015.