The 1998 Calder Cup Playoffs of the American Hockey League began on April 14, 1998. The sixteen teams that qualified, eight from each conference, played best-of-5 series for division semifinals and best-of-7 series for division finals and conference finals. The conference champions played a best-of-7 series for the Calder Cup. The Calder Cup Final ended on June 10, 1998 with the Philadelphia Phantoms defeating the Saint John Flames four games to two to win the first Calder Cup in team history. Philadelphia's Mike Maneluk won the Jack A. Butterfield Trophy as the AHL playoff MVP.