Born in Tomsk (Siberia), she  graduated brilliantly in choir direction in her native town with Maestro Farid Tugushev, then studied at the States University of performing arts with the Art Director of the Bolshoi Theatre, Boris Pokrowsky and graduated in singing at the Tchaikovsky Conservatory in Moscow with Elena Obrazova before getting a new decree in singing with excellent marks also at the "Conservatorio Dall’Abaco di Verona" with Maestro Gianni Mastino.

After her operatic Debut in 1994 as Olga in the Opera "Eugene Onegin" by Tchaikowski, she also appeared as Duniasha in the "Fiancèe of the Zar" by Rimskj-Korsakov and Varvara in "Not Only Love" by Scedrin.

She has since then interpreted the roles of Mamma Lucia in "Cavalleria Rusticana" by Mascagni, Giovanna in "Rigoletto" by Verdi, Fidalma - the main character in "Matrimonio segreto" by Cimarosa, Maddalena - the main character in "Rigoletto" by Verdi, and Carmen in "Carmen" by Bizet. She also took part in a large tour of France in 2001-2002.

In addition to a brilliant Opera career she has profound command of the Russian chamber repertoire (Rachmaninov, Tchaikowsky, Rimskj-Korsakov, Mussorgsky, Shostakovich), the European chamber repertoire (Schubert, Schumann, Debussy, de Falla), as well as frequent excursions into sacred music (Pergolesi, Vivaldi, Mozart, Beethoven, Bruckner, Haydn).

Performances have brought her to sing at the Great Hall and the Rachmaninow Hall in Moscow, for the Italian Institute of Culture in London, the Easter Festival in Austria, the Olympic Theatre in Vicenza, the "Europe Festival" in Rome, the "Arena di Verona" Foundation in Verona, the "Accademia del Teatro alla Scala" in Milan, the Théatres of Paris, Bearritz, Cognac, Perigueux, Niort and the Palais des Beaux-Arts in Charleroi, Belgium, in Spain in the auditorium of the Conservatorium of Tarragona as well as in the Cathedral of El Vendrell, in Tunisia, in Sofia for the Italian Embassy and in most major Italian cities just to mention a few.

Her approach toward 20th century authors, with whom she often collaborates, is also remarkable. Notable engagements include the main character in "Cambio" by M.D‘Amico, "Notturno" by A.Manucci, "Messer Lievesogno" by C.Galante and "Videogames" by L.Lenzi as well as "Mamma Lazer" by F.Biscione.

In April of 2006, together with the Philharmonic Orchestra of Milan, she appeared as Azucena in "Trovatore" and Ulrica in "Ballo in maschera" by G. Verdi at the Teatro Smeraldo.

In 2007-2008 she took part in productions developed by Bolzano-based group "Artisti senza frontiere" (Artists without fronteers) in theatre plays such as "Emma" and "Mathilde" under the direction of Australian art director Tanya Denny.

Since 2005 she has frequently performed for the "Liederiadi" concert series in Milan where she has sung various chamber music programs (being also a co-founding member), with cycles written by Schumann, Brahms, Musorgskij, Tchaikovsky, Chaminade and Respighi.

In February of 2010 she won the International Festival "Russian Singing in the World", resulting the best of the 1500 participants.

In 2011 she made her debut in baroque music performing in the role of Penelope in "The Return of Ulysses" by Monteverdi in the Concertgebouw in Amsterdam, Stuttgart, Dortmund and in the Cité de la musique in Paris with the Ensemble “La Venexiana”.

In 2014 she gives her debut in the "Amadigi" of G.F.Haendel in the Theatres of Bolzano and Merano – doing this as well as a contralto and main character, as also as art director/ scene director of the show.

In 2015 she acts as Bradamante in the "Alcina" by Haendel, under the direction of Riccardo Doni.

Together with her brilliant career as a soloist, Oksana Lazareva also starts a constant career as a stage director in theater musical plays, operettas and musicals such as "Coristrum" (2001), "Marriage of Figaro" (2003), "Magic Flute" (2008), "Pictures of Spanish Life" (2009), "When the Seduction is a Woman" (2009), "The eternal Serenade" (2010), "In the beginning there was music" (2012), "Love at the times of Waltz" (2013), “Amadigi” by Haendel (2014), and "Volver" (2015).

In March 2016 she presents the second edition of the Opera “Amadigi di Gaula” by G.F. Haendel in the Piccolo Teatro Studio in Milan, where she acts again as well as singer and as art director.

Since 1998 she teaches the art of singing at the music institute “A. Vivaldi” in Bolzano