Ellen "Nellie" Farren (16 April 1848 – 29 April 1904) was an English actress and singer best known for her roles as the "principal boy" in musical burlesques at the Gaiety Theatre. Born into a theatrical family, Farren began acting as a child. She made her professional adult debut in 1864 and joined the company at London's Olympic Theatre, performing in Shakespeare, contemporary comedies, dramas and musical burlesques. From 1868 to 1892, she performed at the Gaiety Theatre, which specialised in musical burlesque, becoming famous in the male and principal boy roles, which permitted an actress in the Victorian era theatre to show her legs in tights. Farren gained a large following among the theatre's mostly male audience.