Harmer may refer to:
People:
- Alfred C. Harmer (1825–1900), US Congressman from Pennsylvania
- Ambrose Harmer (died c.1647), Virginia colonial politician
- Barbara Harmer (born 1954), English airline pilot
- Dani Harmer (born 1989), British actress
- David Harmer (born 1983), Australian aviation security consultant
- John Harmer (mayor) (fl. 1737–47), Virginia colonial politician
- John L. Harmer (born c.1934), American politician
- Juliet Harmer (born 1943), British actress
- Nick Harmer (born 1975), American rock musician
- Sarah Harmer (born 1970), Canadian singer-songwriter
- Wendy Harmer (born 1955), Australian writer & comedian
- Sidney Frederic Harmer (1862-1950), British Zoologist
- Russell Harmer (1896-1940), British Olympic Gold Medallist
Places:
- Harmer Hill, village in Shropshire, England
- Harmer E. Davis Transportation Library at the University of California at Berkeley