"I Belong to You (Il Ritmo della Passione)" (English: "I Belong to You (The Rhythm of Passion)") is a duet by Italian singer Eros Ramazzotti and American singer Anastacia, released as the second single from Ramazzotti's eleventh studio album, Calma apparente (2005), and the third from Anastacia's first greatest hits album, Pieces of a Dream (2005). It was met with commercial success in mainland Europe particularly German, peaking at number 1 and becoming the 9th biggest selling song of the year. It also topped the singles charts in, Italy and Switzerland and charted inside the top five in several other countries.

The song is a ballad in which Anastacia sings in English and Ramazzotti in Italian or Spanish. As Ramazzotti records his songs in both Italian and Spanish, there are two versions of this song as well: the original one with Italian lyrics and the other with Spanish lyrics, entitled "I Belong to You (El ritmo de la pasión)", which is available on the Spanish versions of both Ramazzotti's and Anastacia's albums.

While reviewing Anastacia's Pieces of a Dream compilation, Lisa Haines of BBC Music referred to the song as "a gorgeous duet with Eros Ramazzotti which reveals a silkier side to the hard edge normally so distinctive in her voice, and ends with the kind of lung excess that would put Celine Dion to shame."

The music video was directed by Don Allan and was filmed in Rome, Italy, on 21–22 November 2005. In the video, Ramazzotti and Anastacia play a romantic couple.

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