John Foster Loyer[1] (born December 29, 1964)[2] is an American basketball coach.

Loyer graduated from Northmor High School in Galion, Ohio in 1983.

From 2001 to 2003, Loyer was an advance scout for the Blazers, then was an assistant coach from 2003 to 2005 under Maurice Cheeks.

After Cheeks was fired during the 2008–09 season, Loyer stayed on the staff of interim head coach Tony DiLeo.

[8] Loyer became an assistant coach for the Detroit Pistons in 2011 and again served on the staff of Lawrence Frank.