Robert Bryant Plager (March 11, 1943 – March 24, 2021) was a Canadian professional ice hockey defenceman who played in the National Hockey League (NHL) for 14 seasons from 1964 until 1978, primarily for the St. Louis Blues. He spent over half a century with the Blues organization in various capacities. He died on March 24, 2021, 13 days after his 78th birthday.