Walter Alfred Rosam (25 October 1883, in Hamburg – 14 August 1916, in Ukraine) was a German Post-Impressionist painter of Jewish ancestry; known for still-lifes and landscapes.
With Franz Nölken and Friedrich Ahlers-Hestermann, fellow members of the Künstlerklub, he went to Paris in 1907 and became part of the artistic circle that met at Le Dôme Café.
Two years later, he took another trip to Paris with his friends and enrolled for advanced studies with Henri Matisse at his short-lived Académie.
[1] During their time there, they became known as "Die drei Hamburger" as they were always together, painting cityscapes, landscapes in Meulan and nude models at their studio on the Boulevard Edgar-Quinet [fr].
However, one of the main supporters of Siebelist and his students, Alfred Lichtwark, rejected their work because he "could not make friends with the teachings of Matisse".