Olivia (Liva) Järnefelt née Edström (18 March 1876 – 24 June 1971) was a Swedish mezzo-soprano who specialized in opera.

In 1897, after appearing at the Royal Swedish Opera as the Third Boy in Mozart's The Magic Flute and making her actual debut as Pantalis in Boito's Mefistofele, she remained with the company until 1926.

That year she made her official debut as Pantalis in Boito's Mefistofele and also appeared as Frédéric in Mignon by Ambroise Thomas.

She subsequently sang in several Wagnerian operas: Venus in Tannhäuser, Ortrud in Lohengrin, Magdalena in Die Meistersinger von Nürnberg, Brangâne in Tristan und Isolde, Brünnhilde and Fricka in Der Ring des Nibelungen and Kundry in Parsifal.

[1] She is remembered in particular for singing the title role in Samson and Delilah Saint-Saëns, premiered in 1903, for Amneris in Verdi's Aida, Olga in Tchaikovsky's Eugene Onegin, and in particular for her Carmen, which she last performed to celebrate her 25th anniversary with the company.