Admiral Arthur Gerard McDonald, CMM, MSM, CD (born 1967) is a Royal Canadian Navy admiral who served as Chief of the Defence Staff of the Canadian Forces from January 14, 2021, until February 24, 2021, when he voluntarily stepped aside due to an investigation by the Canadian Forces National Investigation Service. On November 25, 2021, McDonald was formally relieved of his command, and replaced permanently by General Wayne Eyre who had held the post during the interim.