The award is presented annually to the most outstanding player in the NHL as voted by fellow members of the NHL Players' Association.
Crosby, Ovechkin and St. Louis have all previously won the award, which is voted on by the players themselves. This year's winner will be announced during the Stanley Cup final.
Crosby, from Cole Harbour, N.S., had 56 points (15 goals, 41 assists) in 36 games this past season. He was tied for third in the league in points, second in assists and first in points per game (1.56).
Ovechkin, from Moscow, won his third Rocket Richard Trophy after leading the NHL in goals with 32. He had 56 points and ranked first with 16 power-play goals.
St. Louis, from Laval, Que., led the league with 43 assists and 60 points. He was second in points per game (1.25).
The award honours Ted Lindsay, an all-star forward known for his skill, tenacity, leadership, and for his role in establishing the original NHLPA.