"Si Piensas, Si Quieres" ("If You Think So, If You Want To") is a Latin pop song by Brazilian recording artist Roberto Carlos from his studio Roberto Carlos 1992 (1991). The track was written by Alejandro Vezanni and Roberto Livi, produced by Livi and features vocals by Spanish performer Rocío Dúrcal. It was released as the album's lead single in Latin America and the United States. A Portuguese-language version of the song was also recorded as "Se Você Quer" with featured vocals from fellow Brazilian singer Fafá de Belém.

The song, about a couple that splits and want to get back together, peaked atop the Billboard's Latin Songs chart, becoming the third number-one song in the chart for both performers and has been included on several compilation albums. "Si Piensas, Si Quieres" earned a nomination for Latin Pop Song of the Year at the American Society of Composers, Authors and Publishers Awards of 1993.

Brazilian singer-songwriter Roberto Carlos recorded his eponymous album released in 1992 and produced by Roberto Livi. The album is the follow up to the self-titled album by Carlos that was awarded the Grammy Award for Best Latin Pop Performance in 1989. Carlos was joined by Spanish singer-songwriter Rocío Dúrcal on the recording of "Si Piensas, Si Quieres", a song about a couple that splits and want to get back together. Upon release in late 1991, the song became a success peaking at the top of the Billboard's Latin Songs chart (formerly Hot Latin Tracks), becoming the third number-one single for Carlos in the chart following "Si El Amor Se Va" ("If Love Goes Away") (1988) and "Abre las Ventanas al Amor" ("Open the Windows for Love") (1990), and also the third for Dúrcal after "La Guirnalda" ("The Garland") (1986) and "Como Tu Mujer" ("As Your Woman") (1989).

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