The Pacific Amphitheatre is an amphitheatre in Costa Mesa, Orange County, California. The amphitheatre is located on the grounds of the OC Fair & Event Center. It opened in July 1983 on the site of the model railroad building of the fairgrounds, with Barry Manilow as the first performer. The fairgrounds are surrounded by dense residential developments, and the amphitheatre was the focus of numerous noise complaints from local residents, prior to being closed in the early 1990s.