Deidre Hall is an American actress and model. She is best known for her portrayal of Marlena Evans on the NBC/Peacock daytime drama Days of Our Lives, who she has played for over 45 years.

Marlena Evans is a fictional character on the NBC/Peacock soap opera Days of Our Lives, a long-running serial about working life in the fictional town of Salem. She has been played by actress Deidre Hall since 1976, but the character was absent from the show from 1987 to August 1991 and again from January 2009 to September 2011. Marlena was created by scriptwriter Pat Falken Smith and executive producer Betty Corday, and has become one of Days of our Lives' most well-known characters. Hall made her debut on the soap on June 21, 1976, currently making her the second longest running actress on the serial, surpassed only by Suzanne Rogers.