"Sin Contrato" () is a song by the Colombian singer Maluma taken from his second album Pretty Boy, Dirty Boy (2015). Maluma co-wrote the song with producer Andrés Castro. It was released as the album's fourth single on 26 August 2016 through Sony Music Latin. The song peaked at number three in Colombia and at number seven on the US Hot Latin Songs chart.
The song featuring guest vocals from the American girl group Fifth Harmony released in November 2015 in North America and Europe during their duet performance at 16th Annual Latin Grammy Awards and other versions featuring the Puerto Rican singers Don Omar and Wisin released on the same month.
The music video for "Sin Contracto" premiered on 26 August 2016 on Maluma's Vevo account on YouTube. The music video was directed by Jessy Terrero and was filmed across various locations in the Dominican Republic. It features Yaritza Reyes who represented the Dominican Republic at Miss Universe 2013 in Russia and Miss World 2016 in the United States. The music video has over 990 million views on YouTube.