Valdemar Andersen (3 February 1875 – 15 July 1928 in Copenhagen) was a Danish painter, illustrator, graphic designer and decorative artist.

He also attended Copenhagen Technical School (H. Grønvold) and studied one semester at the Royal Danish Academy of Fine Arts in autumn 1894.

He soon began to receive commissions from Ernst Bojesen at Gyldendalske Boghandel (Nordisk Forlag), culminating with the illustration of Carit Etlar's works (1905–06) and Feltlægens Historier by Zacharias Topelius (1906–08).

His works as a painter include portraits of Henrik Cavling, Ludvig Kraft, Peter Nansen and Henri Nathansen.

[2] As a decorative artist, Andersen collaborated with Anton Rosen, working on projects such as the Metropol Building in Copenhagen (1906–07), the Danish National Exhibition of 1909 in Aarhus and Palace Hotel (vestibule, 1910).