Harmer is a surname. Notable people with the surname include:
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
Florence Harmer (1890–1976), English historian
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
