Leon Dabo (July 9, 1864 – November 7, 1960) was an American tonalist landscape artist best known for his paintings of New York, particularly the Hudson Valley. His paintings were known for their feeling of spaciousness, with large areas of the canvas that had little but land, sea, or clouds. During his peak, he was considered a master of his art, earning praise from such luminaries as John Spargo, Bliss Carman, Benjamin De Casseres, Edwin Markham, and Anatole Le Braz.