Glenn Layendecker (born May 9, 1961) is a former professional tennis player from the United States. His highest singles ranking was world No. 48 in 1990. Layendecker's highest doubles ranking was world No. 32. His career wins included wins over Andre Agassi, Michael Chang, Yannick Noah, Aaron Krickstein, Anders Järryd, and Brad Gilbert in singles matches. He also beaned John McEnroe in the temple with an approach shot at the US Open. Layendecker graduated from Yale University in 1983.