Glen Helen Amphitheater, Outdoor amphitheater in San Bernardino, United States.

Glen Helen Amphitheater is a large outdoor music venue in San Bernardino County with capacity for about 65,000 people spread across hillside sections and grass areas. The grounds include pathways connecting different parts of the seating, food vendors at various points, and designated parking areas surrounding the site.

Glen Helen Amphitheater was built in 1982 for the US Festival, held on grass-only grounds that drew 300,000 people; the site was reused for US Festival 2. It later became a permanent venue known as Glen Helen Pavilion, then Blockbuster Pavilion and Hyundai Pavilion. In 2008 the San Manuel Indian Casino bought naming rights, and after that contract expired in January 2017 the venue returned to the name Glen Helen Amphitheater.

The venue's name changed with its sponsors: it opened as Glen Helen Pavilion, became Blockbuster Pavilion and Hyundai Pavilion, was San Manuel Amphitheater from 2008 until the casino's naming contract expired in January 2017, and then took its current name. Its season runs March to November, and the grounds close for winter.

The venue spreads across hillside terrain, so comfortable shoes are important for walking between different seating areas and parking zones. Operations run seasonally from spring through fall, so checking event dates ahead of time helps with planning your visit.

The site was first used for the US Festival in 1982, which drew 300,000 people to a grass-only field before the permanent amphitheater opened in 1993. The two blue steel scaffold towers flanking the stage, visible from the lawn, carry the sound and lighting rigs.