Valdemar Heinrich Nicolas Irminger (1850-1938) was a Danish painter.
Born in Copenhagen, Irminger attended the Royal Danish Academy of Fine Arts from 1867 and 1873.
He went to Italy on a scholarship from 1884 to 1887.
In 1888, he won the Academy's medal for Motiv fra Børnehospitalet ved Refsnæs (View from the Children's Hospital at Refsnæs) and the following year for Fra et Børnehospital (From a Children's Hospital).