Frederick James "Mickey" Ion (February 25, 1886 – October 26, 1964) was a Canadian professional lacrosse player and ice hockey referee.

Among his innovations was the first known season-ending All-Star team, the naming of which was a regular practice of his from then on and which received much publicity each year.

Ion was primarily a defensive player in the 'cover point' and three 'defense' positions with a decent knack for goals-scoring—an unusual occurrence back in those days.

He then moved west in 1911 when the Vancouver Lacrosse Club team in the professional BCLA league signed him.

Toronto Tecumseh captain Charles Querrie, along with a big group of other lacrosse men, attended the court when Ion was handed his verdict.