"X Si Volvemos" (stylized in all caps; a shortened abbreviation for Por Si Volvemos (transl. "If We Get Back Together")) is a song by Colombian singer-songwriter Karol G and American singer Romeo Santos. It was written by Giraldo, Santos, Nesty la Mente Maestra, Nely el Arma Secreta, Wisin, Yandel, Keityn and Ovy on the Drums, and produced by the latter. The song was released on February 2, 2023, through Universal Music Latino, as the fourth single from Karol G's fourth studio album, Mañana Será Bonito (2023).