The chief justice of Canada (French: juge en chef du Canada) is the presiding judge of the nine-member Supreme Court of Canada, the highest judicial body in Canada. As such, the chief justice is the highest-ranking judge of the Canadian court system. The Supreme Court Act makes the chief justice, a Crown in Council appointment, meaning the Crown acting on the advice of the prime minister and minister of justice. The chief justice serves until they resign, turn 75 years old, die, or are removed from office for cause. By tradition, a new chief justice is chosen from among the court's incumbent puisne justices.
The chief justice has significant influence in the procedural rules of the Court, presides when oral arguments are held, and leads the discussion of cases among the justices. The chief justice is also deputy governor general, ex-officio chairman of the Canadian Judicial Council, and heads the committee that selects recipients of the Order of Canada. Additionally, a chief justice also assumes the role of Administrator of Canada and exercises the viceregal duties of the governor general upon the death, resignation or incapacitation of the governor general.