The German contralto, Sieglinde Wagner, was trained at the Conservatory of Linz, then with Luise Willer und Carl Hartmann in Munich.
In 1942 Sieglinde Wagner made her debut at the National Theatre of Linz as Erda in "Rheingold". She continued then her studies its study at the Münchner Musikhochschule. In 1947 she was engaged by the Wiener Volksoper, to which she belonged until 1952. Since 1952 she was active at the Städtischen Oper, later Deutsches Opernhaus Berlin, and remained their member until 1987. She made guest appearance, among other things at the Milanís La Scala, at the Opera of Rome, in Amsterdam, Madrid and Barcelona.
Since 1949 Sieglinde Wagner participated in the Festival of Salzburg. Here she sang a multiplicity of roles: 1949-51 and 1959-60 one of the ladies in Zauberflöte, 1950 Lady Capulet in the premiere of the opera Romeo and Julia by Boris Blacher, August 1952 Leda in the premiere of Liebe Danaee by R. Strauss, 1953 and 1961 the Annina in Rosenkavalier, 1953 and 1957 Marcellina in Le Nozze di Figaro, 1957 one of the farm servants in Elektra by R. Strauss, 1959 and/or 1961 in the premiere of the opera Julietta by H. Erbse (as a nut/mother) and Das Bergwerk zu Falun by Rudolf Wagner-Régeny (as Frau Jensen). With the Festival of Bayreuth she participated in 1962-69 as Grimgerde and 1971-1973 as Rossweisse in Walküre, 1963 as well as 1968-1973 as Blumenmädchen, 1968, 1971 and 1973 as alto solo in Parsifal, 1971 as Mary in the Fliegenden Holländer and 1970 as Magdalene in Meistersingern.
As a concert and oratorio alto singer, Sieglinde Wagner was also active successfully, especially as an interpreter of the works of J.S. Bach.
Recordings: DGG (Weihnachts-Oratorium (BWV 248) by J.S. Bach, Zauberflöte, twice Fliegender Holländer), HMV, Philips, Decca (Fledermaus), as well as complete on other labels, particularly on Electrola-HMV. On Cetra she sings a small part in Elektra recorded at Salzburg Festival of 1957, on Fonit Cetra alto solo in Missa Solemnis by L.v. Beethoven and to 3rd Lady in Zauberflöte (Salzburg, 1951), the same role also on Discocorp (Salzburg, 1949).