Jonkheer Dirk Jan de Geer (14 December 1870 – 28 November 1960) was a Dutch politician of the Christian Historical Union.

After the fall of the fifth cabinet of Hendrikus Colijn, De Geer again formed a government in August 1939 and concurrently held the offices of Minister of Finance and of General Affairs.

At the instigation of Queen Wilhelmina, he was removed from office and replaced by Pieter Sjoerds Gerbrandy – officially on account of ill-health.

He never arrived there, for on a stopover in Portugal he left the flight and went to the Germans, who allowed him to return to his ailing wife and the rest of his family in the Netherlands.

De Geer died on 28 November 1960 at Soest, Netherlands, at the age of 89, 16 days before his 90th birthday, several years after having suffered a stroke.