Achenbach is a German surname. Notable people with the surname include:Andreas Achenbach (1815–1910), German painter Ernst Achenbach (1909–1991), German diplomat and politician Gerd B. Achenbach, German philosopher Heinrich von Achenbach (1829–1899), Prussian politician, agriculture minister Jan D. Achenbach (1935–2020), American professor at Northwestern University Joel Achenbach, American journalist Max Alvary (1856–1898), originally Maximilian Achenbach, German tenor Oswald Achenbach (1827–1905), German painter Thomas M. Achenbach (1940–2023), American psychiatrist Timo Achenbach, German footballer