Karel Aguilar Chacón (born 5 April 1980) is an athlete from Cuba.

His first major success came in 2003 when he won the C-1 500 m gold medal at the Pan American Games in Santo Domingo, Dominican Republic.

Two weeks later, at the world championships in Gainesville, USA he reached two finals, finishing fourth in the C-1 500 m and eight in the C-1 1000 m. Chacon competed at the 2004 Summer Olympics, this time in the C-1 1000 m. He placed third in his initial heat with a time of 3:54.250, qualifying for the semifinals.

After the 2004 Olympics, he and Serguey Torres were chosen as Cuba's new C-2 pairing for international competitions.

Replacing the former world champions and Olympic medallists Ibrahim Rojas and Ledys Frank Balceiro was no easy task but Aguilar and Torres enjoyed immediate success at the 2005 World Championships in Zagreb, Croatia.