Aert Jansz or Jan Aertsz Marienhof, was a Dutch Golden Age painter.

According to Arnold Houbraken he left Utrecht for Brussels and made small paintings in the style of Rubens that were quite popular. He married young, and died young.

According to the Netherlands Institute for Art History, Aert Jansz was the son of the glass painter Jan Aertsz Marienhof and their work is sometimes confused with each other. Today this name is generally only used in reference to paintings.