Soile Marja Isokoski (born 14 February 1957) is a Finnish lyric soprano, active in opera, concert works and lieder.
The New York Times wrote on 28 January 2002: "Ms. Isokoski... touched on the Countess' sense of abandonment by the Count without diminishing her regal bearing or the graceful humor she must contribute to the second act.
"[2] In 2007 Isokoski made her San Francisco Opera debut portraying the role of the Marschallin in Der Rosenkavalier.
She has given recitals with her regular accompanist Marita Viitasalo-Pohjola [fi] all over the world, including in New York, Washington, D.C., Fort Lauderdale, Vienna, London, Paris, Amsterdam, Berlin, Munich, Rome, Athens, Moscow, Saint Petersburg, and Tokyo.
Isokoski has appeared with many renowned conductors including Claudio Abbado, Vladimir Ashkenazy, Daniel Barenboim, James Conlon, Andrew Davis, Colin Davis, John Eliot Gardiner, Daniele Gatti, Valery Gergiev, Bernard Haitink, Marek Janowski, Neeme Järvi, Okko Kamu, James Levine, Zubin Mehta, Yehudi Menuhin, Riccardo Muti, Sakari Oramo, Seiji Ozawa, Simon Rattle, Esa-Pekka Salonen, Jukka-Pekka Saraste, Leif Segerstam, and Osmo Vänskä.