Diane Thomas (born Diane Fowler), known professionally as Sunset Thomas, is an American artist and former pornographic actress. She was runner-up for Penthouse Pet of the Year in 1998 and is a member of the AVN, XRCO, and Legends of Erotica halls of fame. Thomas is the aunt of porn star Sunrise Adams, during a visit by her niece she convinced Adams to begin a career in adult films.

Thomas moved around often in her youth with her family, living in various states including Virginia, Georgia, Texas, and Tennessee. She spent her teenage years in Daytona Beach, Florida. In Florida she became something of a wild child, sacrificing school and books for sunning and bikinis on the Florida beaches. She failed to graduate high school and also became addicted to methamphetamine. She entered the adult film industry in 1991 with her then-husband Zack Thomas. In the 2000s Thomas worked as a prostitute at the Moonlite BunnyRanch in Nevada, she later told interviewer Andrew Anthony that there is no real difference between pornography and prostitution.