Former Spanish king, abdicated 2014.

Juan Carlos Onetti Borges (July 1, 1909 – May 30, 1994) was a Uruguayan novelist and author of short stories.

Juan Carlos Ferrero Donat (born 12 February 1980) is a Spanish former ATP World No. 1 tennis player and current coach.

Juan Carlos Varela Rodríguez (born 13 December 1963) is a Panamanian businessman and former politician who served as the 37th president of Panama from 2014 to 2019.

Rey Juan Carlos University is a Spanish public research university located in the southern area of the Community of Madrid (Spain), with five campuses at Móstoles, Alcorcón, Vicálvaro, Aranjuez and Fuenlabrada.

Juan Carlos Ortiz Escobar (died in 2002)