Charmian Carr (born Charmian Farnon December 27, 1942) is best known for her role as Liesl, the eldest Von Trapp daughter in The Sound Of Music where she starred with Julie Andrews, Christopher Plummer, Nicholas Hammond, Heather Menzies, Angela Cartwright and Kym Karath.

The second child of vaudeville actress, Rita Oehmen, and musician Michael Farnon who named each of his daughters after Shakespearian characters. She has two sisters, one older and one younger. While working as a physician's assistant, a friend asked her to audition for the role of Liesl the Sound of Music. Director Robert thought Farnon to long a surname for her, and after handing her a list of single syllable surnames she chose Carr. While publicising the film after release, she met and married Jay Brent in 1967 and had two daughters, Jennifer and Emily. The marriage lasted until 1991. She started an interior decorating company whose clients include Michael Jackson.

She has written two books, Forever Liesl and Letters to Liesl.