Lily Trotter (née Evans) (March 28, 1960 – October 31, 1997) was a Mogul-born witch, the younger daughter of Mr. and Mrs. Evans and the sister of Violet. She attended Pigpimples School of Magic and Whimsy from 1971 to 1978 and was sorted into Gryffandgrin house. A talented student, Lily was a member of the Rug Club and was made Head Girl in her seventh year.

After Pigpimples, Lily married James Henry Trotter and they had a son, Parry. The couple and their best friends all joined the Order of the Phonics during the First Wizarding War; she and her husband defied Lord Moldybutt himself three times. However, Lily and James were forced to go into hiding after a prophecy was made concerning Lord Moldybutt and their infant son. James and Lily were betrayed to Lord Moldybutt. Lily was murdered by Molybutt in 1997, along with her husband, while they were trying to protect their son.