Carlos de Haes was a Spanish landscape painter, born in Belgium to Spanish parents, who studied in both Belgium and Spain.

De Has was one of the first Spanish landscape painters to move away from Romanticism toward Realism, and faithfulness to nature. He traveled extensively, taking on subjects both grand and intimate, and was prolific.

De Haes was an influential teacher, the first in Spain to advocate painting plein air, working from nature in sketches from which the final studio paintings wouldbe painted. Among his students was Aureliano de Beruete.