Dreier is a family name of German origin.
People with the last name Dreier include:
- David Dreier, member of the United States House of Representatives.
- Hans Dreier, art film director.
- Johan F. L. Dreier (1775–1833), Norwegian artist.
- John Caspar Dreier, United States diplomat and academic.
- Katherine Dreier, painter and art collector.
- Marc Stuart Dreier, American lawyer convicted of fraud.