Valdemar Rørdam (23 September 1872 – 13 July 1946) was a Danish national conservative poet and author.

His son Helgo Rørdam had emigrated to Finland, where he participated as a volunteer in the Winter War, and was killed in battle against the Soviets.

In 1941 Rørdam published the poem "Then came the day that we have long awaited", in which he praised Adolf Hitler's efforts to eradicate bolshevism.

The fact that he later wrote a tribute to Christian Frederik von Schalburg, the leader of the Danish Free Corps Denmark who fell on the eastern front in German service, did not ameliorate matters.

Rørdam retired to western Zealand, where he stayed for several years with his friend Sigurd Swane until his death in 1946.