Gustavo de Jesús Gaviria Rivero (25 December 1946 – 11 August 1990) was a Colombian drug trafficker. As Pablo Escobar's cousin and right-hand man, Gaviria controlled the Medellín cartel's finances and trade routes. He and Escobar had collaborated in their criminal careers since the early 1970s.

Though he was the owner of a fortune comparable to Escobar's and even had a military apparatus at his service, Gaviria was not as well known, as he kept a low profile.

The operation to find Gustavo was carried about by a special forces unit Search Bloc. Police had managed to track down the location of Gustavo Gaviria in a wealthy Medellín neighborhood. Gaviria was killed in the skirmish on the spot.

After Gustavo's death, Escobar decided to turn himself in but to stay at La Catedral, a jail of his own making, guarded by his own guards. Since Gustavo died four days after President César Gaviria took office, at the time, the media and the country in general thought the president had begun his term with an offensive against the narcoterrorists. Gustavo's death triggered a counter-offensive by Escobar that initially destabilised administration.