The Canadian Bar Association is a national association of lawyers in Canada. The presidents of the Canadian Bar Association are leading figures at the bar, often serving in public offices as well. Two presidents of the Association have gone on to the office of Prime Minister of Canada, and three have been justices of the Supreme Court of Canada. One has served as Lieutenant Governor of Manitoba, and one has been Canada's Ambassador to the United Nations. Many presidents have worked in private practice, from large firms to small ones across the country. Several have gone on to appointments to the Bench.