Estebán Blanco Uhlenhaut (born December 16, 1981) is a Costa Rican former swimmer, who specialized in sprint freestyle events.
Representing Costa Rica at the 2000 Summer Olympics, he currently holds a national record in the 50 m freestyle that stood for more than a decade.
Blanco competed only in the men's 50 m freestyle at the 2000 Summer Olympics in Sydney.
He achieved a FINA B-standard entry time of 23.87 from the Central American and Mexican Championships in his hometown San José.
Swimming in heat three, Blanco powered past the entire field to a top seed in a new Costa Rican record of 23.72.
Blanco's blistering triumph was not enough to put him through to the semifinals, as he placed forty-fifth overall out of 80 swimmers in the prelims.