"Día de Suerte" ("Lucky Day") is a Latin pop song by Mexican recording artist Alejandra Guzmán. Produced by Armando Avila, the track was released as the main theme for the Mexican telenovela Una Familia con Suerte. The song was included in the setlist of Guzmán's live album 20 Años de Éxitos En Vivo con Moderatto (2011) and was performed by the singer and Moderatto. The studio version of the track is featured on the album as a bonus track.

"Día de Suerte" has charted within the top ten in the United States and became sixth top ten single for Guzmán on Billboard's Latin Pop Songs chart and also reached a peak atop the Mexican Airplay charts. Guzmán performed the track at the TVyNovelas Awards and received nominations for the Premios Oye! and Lo Nuestro.

"Día de Suerte" was written by Mexican singer-songwriter Alejandra Guzmán and José Luis Ortega, produced by Armando Avila, and performed by Guzmán. The song is featured as the main theme for the Mexican telenovela Una Familia con Suerte, produced by Juan Osorio and starred by Arath de la Torre, Mayrín Villanueva and Luz Elena González. The telenovela began its broadcasting on February 14, 2011 and featured Guzmán in a supporting role named Viridiana, in honor of her late sister Viridiana Alatriste. The song was released during the accusations made to the singer of having participated in a narcofiesta circa 2006, to which the singer responded: "I do not care about that [the accusations]."

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