Glen Alvelais (born February 22, 1968) is a heavy metal lead guitarist from the San Francisco Bay Area. Alvelais was the lead guitarist for Forbidden and has also played in Testament.
Glen left Forbidden in 1989, a year after the release of their cult classic debut Forbidden Evil. In 2008, Glen orchestrated the re-uniting of Forbidden, and has written guitar solos for the metal band Tenet, featuring Jed Simon, Gene Hoglan, and Steve "Zetro" Souza. As of July 2009, Glen is no longer part of Forbidden's reunion.