An interim leader, in Canadian politics, is a party leader appointed by the party's legislative caucus or the party's executive to temporarily act as leader when a gap occurs between the resignation or death of a party leader and the election of their formal successor. Usually a party leader retains the leadership until a successor is formally chosen — however, in some situations this is not possible, and an interim leader is thus appointed by the party's caucus or the party executive. An interim leader may also be appointed while a leader is on a leave of absence due to poor health or some other reason, and then relinquish the position upon the leader's return.