Paul Wilhelm Keller-Reutlingen, or Paul Wilhelm Keller was a German landscape and genre painter.

Keller attended the Reutlingen secondary school from 1862 to 1868 and learned the profession of xylograph from 1868 to 1872 from Adolf Closs in Stuttgart. From 1872 to 1873 he studied at the Stuttgart art school with Bernhard von Neher and from 1873 to 1874 he was a pupil of Otto Seitz at the Royal Academy of Arts in Munich. He then attended Professor Carl von Häberlin's painting class in Stuttgart until 1875.

From 1875 to 1876 he did military service in Ulm and then traveled to Italy, where he visited Venice, Florence, Rome, Naples and Capri until 1879. He settled in Fürstenfeldbruck. On November 15, 1898, he married the actress Albertine Wetzel. In 1899 he was appointed professor. In 1902, Keller moved back to Munich.

From 1893 he was a founding member of the Munich Secession and took part in exhibitions in the Munich Glass Palace, the Secession and the Great Berlin Art Exhibition .