Loca (Shakira song)

"Loca" (English: "Crazy") is a song by Colombian singer-songwriter Shakira and the lead single from her ninth studio album, Sale el Sol (2010). It was based on a previously-released version by Dominican rapper El Cata, and two versions were released. Written by the two said artists and Pitbull, the Spanish-language version featuring El Cata was released on 10 September 2010. The English-language version, additionally written by and featuring British rapper Dizzee Rascal, was released on 13 September 2010. A Latin pop and merengue track, "Loca" describes Shakira's eccentric infatuation with a man.

"Loca" received generally favorable reviews from music critics, who particularly commended the merengue sound. The English version peaked within top five of the record charts of many countries including Austria, Belgium, France, Hungary, and Italy, while Spanish version reached number one in Spain and Switzerland as well as on the Billboard Hot Latin Songs, Latin Pop Airplay, and Tropical Songs charts. "Loca" has been certified diamond in Colombia and multi-platinum in Italy, Mexico, and Spain. In August 2014, Dominican songwriter Ramon "Arias" Vasquez sued Shakira for plagiarizing his mid-1990s song "Loca con su Tiguere". The case was dismissed in August 2015 after it was found that Vasquez had fabricated the evidence he had presented in court.

Its accompanying music video was filmed in Barcelona, Spain in August 2010, and was released the following month. It features Shakira interacting with a beach crowd, and dancing in front of the sea wearing a golden bikini. It generated a favorable response from critics, many of whom praised its concept for matching the vibe of the song. Shakira has performed "Loca" on several television shows and on three of her world tours: The Sun Comes Out World Tour (2010), El Dorado World Tour (2018), and Las Mujeres Ya No Lloran World Tour (2025).