Stephanie Green, better known by her stage name Viper (September 12, 1959 – December 24, 2010) was an American pornographic actress known for a prominent full body snake tattoo, for co-founding Fans of X-Rated Entertainment with Bill Margold, and for her abrupt disappearance from the industry in 1991.

Born in Tennessee but raised in New Hampshire, Green had danced in the ballet throughout child and was training in New York City until she grew tired and in 1978 joined the United States Marine Corps, rising to the rank of corporal. After six years, Green was expelled from the Corps for fraternizing with her superior officers, and worked a year in Baltimore as a prostitute and an entertainer at a nightclub. In 1986, Green moved to Los Angeles to enter the pornographic film industry. Soon thereafter she met Bill Margold, an influential pornographic actor, director, and agent. They began a romantic relationship and lived together. Adopting the stage name of “Viper”, she made over seventy hardcore pornographic films. She won the 1990 AVN Award for Best Supporting Actress.

In May 1991, Viper abruptly disappeared from public life and returned to New Hampshire. Her boyfriend of five years, Bill Margold, never saw her again. Margold believed Viper's recent breast implants caused her to have a mental breakdown. She died in 2010 of lung cancer, her obituary stated she had worked as a hair stylist and phlebotomist.