CCGS John A. Macdonald was a Canadian Coast Guard heavy icebreaker. She was named after The Right Honourable, Sir John Alexander Macdonald, GCB, KCMG, PC, PC (Cananda), the First Prime Minister of Canada. She was commissioned into the Canadian Department of Transport's Marine Service in 1960 using the prefix "Canadian Government Ship" (CGS). She was transferred in 1962 into the newly created Canadian Coast Guard (CCG) and served with distinction until being decommissioned in 1991, and replaced by the then-chartered (but later purchased) CCGS Terry Fox.