Surname
- Albrecht Mertz von Quirnheim, (1905–1944), German officer and resistance fighter involved in the July 20 Plot against Adolf Hitler
- Barbara Mertz (born 1927), author of mystery and suspense novels who writes under the pseudonyms Elizabeth Peters and Barbara Michaels
- Dolores Mertz (born 1928), Iowan politician
- Elizabeth Mertz, American linguistic and legal anthropologist
- Fred and Ethel Mertz, fictional couple on I Love Lucy
- Harold Mertz, designer of the standard crash test dummy
- Johann Kaspar Mertz (1806–1856), Hungarian composer
- Lawrence Mertz, optical physicist and inventor of the Mertz corrector
- LuEsther Mertz (1905–1991), founder of Publisher's Clearinghouse
- Stephen Mertz (born 1947), American fiction author of thrillers and novels of suspense
- Xavier Mertz (1883–1913), Swiss Antarctic explorer
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