CCGS John G. Diefenbaker is the name for a Canadian Coast Guard icebreaker that had been expected to join the fleet by 2017 but has been significantly delayed. Her namesake, John G. Diefenbaker, was Canada's 13th prime minister. It was Diefenbaker's government that founded the Canadian Coast Guard in 1962. The revised service entry date for the first vessel was projected as 2030. The budget for this expanded program was unknown. In late 2021, the Parliamentary Budget Officer estimated the cost for two ships at $7.25 billion.