Aleksander Lesser (13 May 1814 – 13 March 1884) was a Polish painter, illustrator, sketch artist, art critic, and amateur researcher of antiquities who was of Jewish descent.
Lesser holds a place in Polish art history "as an outstanding representative of his country’s historical school." He specialized in Polish historical and contemporary themes, and he was known and respected in artistic and scholarly circles.
He was a member of Kraków's Academy of Learning and co-founder of Warsaw's Zacheta, the Society for Encouragement of the Fine Arts.