Ellen Winther was born as Ellen Sørensen, as the daughter of the merchant Laurits Sørensen and his wife Esther.
Winther studied music education at the Det Jyske Conservatory of Music in Aarhus. In 1955 she graduated from there with a diploma. Subsequently, she completed until 1957 at the Music School of Det Kongelige Teater vocal training for the opera singer. She made her stage debut as an opera singer, she was with the role of Cherubino in Le nozze di Figaro. From 1957 to 1987 she was a permanent member of the Det Kongelige Teater. She sang mainly the role of the specialist and the soubrette Koloratursoubrette, went there but also as an actress. Winther took focus roles in operettas: Adele in Die Fledermaus was one of their special shine roles. Occasionally they came again and again as an opera singer in appearance, so as Violetta in La traviata. Guest appearances as an opera singer, she was partly due to the Den Jyske Opera in Århus. In 1964 she guested on the Kiel Opera House.
As an actress, she stood at the Det Kongelige Teater including as Puck in A Midsummer Night's Dream (1957 ), in the season 1971/1972 as a maid Pernille in Ludvig Holberg's comedy The waverer (The vægelsindede ) in 1986 Clotilde Pontagnac in the comedy One must Stupid be of Georges Feydeau on stage.
In 1975 she sang at the Scala Theatre in Copenhagen, the role of Alice Couder in the operetta The Dollar Princess. She also appeared in music revues and musicals, so among other things in 1994 at the theater in Copenhagen Amagerscenen as Mother Superior in the musical The Sound of Music. As a theater actress, she was often in the comedy Lend Me a Tenor ( Skaf mig en tenor ) seen by Ken Ludwig, so in 1992 at the private Teatret in Copenhagen ..
Winther was involved in some operetta films and operetta films for Danish television, as Hannerl Tschöll in The House of Three Girls (1959 ), as Adele in Die Fledermaus (1968), as Ciboletta in A Night in Venice (1969) and as Princess Helene in A Waltz Dream (1967).
In 1962, Ellen Winther part with the song Vuggevise for Denmark at the Grand Prix Euro Vision Song Contest; she reached the 10th place. It was her only appearance at the Grand Prix Euro Vision Song Contest.
In 1983 she received the Dannebrogorden for their artistic achievements. She was awarded the Olaf Poulsen Actor award in 1996.
Winther was married twice. From 1960 to 1966 she was with the Danish pianist John Winther ( born 1933 ) married. His second wife she was married from 1973 to 1997 until his death with the politician Hans Jørgen Lembourn. Winther died at the age of 78 years.