Glen Lang is a American businessman and politician who served as mayor of Cary, North Carolina from 1999 to 2003.

Lang, a millionaire and CEO of a wireless communications company, first entered politics in 1997 with a self-financed bid for the Cary Town Council. He won, and, two years later, sought and was elected mayor. During his time in Cary politics, Lang was an outspoken advocate of slower growth for the rapidly-expanding town as well as for infrastructure improvements. Lang was a controversial figure in Cary politics, often described as arrogant or combative. Lang ran for re-election in 2003 and placed third; he had chosen only to spend $10 on his campaign. He was succeeded as mayor by Ernie McAlister.