"Il mio tesoro" (or "Il mio tesoro intanto") is an aria for lyric tenor voice from scene 2 in act 2 of Mozart's opera Don Giovanni. It is often performed in recitals and featured in anthologies of music for tenor.[1] In the aria, Don Ottavio, a young nobleman, urges the listener to assure his (the nobleman's) beloved fiancée, Donna Anna, that he intends to secure vengeance for her against the man who murdered her father.