McGill led the Attack to an all-time franchise best record of 49-15-2-2 for 102 points to earn the Matt Leyden Trophy. The beat the club's previous record of 46 wins and 97 points set in 2010-11.
In a release from the OHL McGill says he's humbled to receive the award.
"All of our staff members and all of our players share in this award because without their dedication to excellence every day we wouldn't be where we are today. Their approach to getting better every day has been nothing short of spectacular."
The Attack are the league's most improved team from 2015-16, increasing their win total by 17 and points total by 27.
"Ryan was a terrific hire two years ago and has been engaged with this group from the first time we all got together last year,” said Attack General Manager Dale DeGray. “He is a perfectionist that expects his players to want to put in the same amount of time and preparation that he does. That dedication rubs off on the players and we've seen what can happen through that hard work and passion."
McGill will be presented with the Matt Leyden Trophy at the OHL Awards Ceremony on Thursday, June 8th at the Hockey Hall of Fame in Toronto.