Oswald Achenbach (born Feb. 2, 1827, Düsseldorf, Prussia—died Feb. 1, 1905, Düsseldorf, Ger.) was a landscape painter of the Düsseldorf school who is distinguished for his colourful renderings of the Bay of Naples, of Rome, and of Venice. He broke away from the traditional classicist interpretation of these scenes and revelled in strong and glowing colour effects. His more famous brother, Andreas, influenced his work.