Vice-Admiral Gregory Ralph Maddison CMM, MSC, CD (born 6 August 1949)[1] is a retired officer of the Canadian Forces.

[2] He became Commanding Officer of the destroyer HMCS Athabaskan in 1986, Director Maritime Operations Plans and Reserves in 1989 and Commander of the First Canadian Destroyer Squadron in 1991.

[2] He went on to be Commander of NATO's Standing Naval Force Atlantic in 1993, Assistant Chief of Staff (Personnel & Training) in 1994 and Chief of the Maritime Staff in September 1997.

[2] His last appointment was as Deputy Chief of the Defence Staff in May 2001[3] before retiring in 2005.

Maddison's personal awards and decorations include the following: