Carlos Federico Sáez (14 November 1878, Mercedes – 4 January 1901, Montevideo) was an artist from Uruguay.
He was born into a wealthy family in the city of Mercedes in western Uruguay.
The well-known painter Juan Manuel Blanes recommended that Sáez go to study in Italy, which was a fairly common practice for wealthy young artists in Uruguay at that time.
His work is characterized by loose brush strokes that still convey a realistic precision.
While he was in Italy he painted a number of portraits where the canvas is left visible – a technique used in abstract art, and which was not seen elsewhere until 1910.