Debi Diamond is a retired American porn star, adult model, exotic dancer and producer.

She began her adult film career in 1983 under the pseudo name of Shelly Rey. The high point of her career was arguably in the early '90s, when she worked virtually non-stop and her performances garnered many industry awards, including induction into the XRCO and the AVN Halls of Fame. She was notorious as one of the first "gonzo" pornstars, meaning she would do just about any sex act; anal, ass to mouth, double penetration, even choking and suffocation years before they became en vogue.

She initially retied in 1995 but resurfaced in 2007 on Myspace after nearly 12 years out of the spotlight, sporting newly enhanced DD breasts. In an interview with porn journalist Gene Ross, she said during her absence she had married (and has since divorced) and had three children. She made her first public appearance since leaving the porn industry at the 2008 AEE Convention signing for PAW/Arrow. In early 2009, she began to perform in adult films again for a second stint in the industry that lasted until 2011.