Margaret "Peggy" Olson is a fictional character on the AMC television series Mad Men. She was portrayed by Elisabeth Moss and served as the show's female lead. Initially, Peggy is secretary to Don Draper, creative director of the advertising agency Sterling Cooper. She soon discovers her passion for copywriting and due to her talent, Draper takes her on as his protégé. Her rise is an integral part of the series and plays a key role in every season of Mad Men. After Don, she has the highest number of episode appearances, appearing in 88 out of the 92 episodes.

Mad Men is an American period drama television series created by Matthew Weiner and produced by Lionsgate Television. It ran on cable network AMC from July 19, 2007, to May 17, 2015, with seven seasons and 92 episodes. It is set during the period of March 1960 to November 1970.