Merz is a German surname. Notable people with the surname include:
Aaron Merz (b. 1983), US football player
Albert Merz (?-1941), One of 3 German brothers (w August and Rudolf) who were imprisoned in Nazi Germany for refusing to bear arms. He was executed.
Alessia Merz (b. 1974), Italian television personality
Annette Merz (fl. 1990s), German Protestant theologian, biblical scholar
Alfred Merz (1880–1925), Austrian-German oceanologist
Bruno Merz (b. 1976), New Zealand-born musician, composer, working in Netherlands
Charles Hesterman Merz (1874–1940), Pioneer of the National Grid UK
Charlie Merz (1888–1952) US racecar driver
Curt Merz (b. 1938), US football player
Friedrich Merz (b. 1955), German politician (CDU)
Georg Merz (1793-1867), German optical instruments manufacturer
Hans-Rudolf Merz (b. 1942), President of Switzerland (2009)
HG Merz (b. 1947), German architect, museum designer
Ivan Merz (1896–1928), blessed, Croatian Catholic lay activist
Joachim Merz (b. 1948), German economist
John Theodore Merz (1840-1922), English-born German chemist, historian, industrialist
Jon F. Merz (fl. 1990s), US author
Joseph Anton Merz (1681–1750), German painter
Karl Spruner von Merz (1803-1892), German cartographer, scholar
Klaus Merz (b. 1945), Swiss writer
Louis L. Merz (1908-2002), Political figure in US state of Wisconsin
Markus Merz, founder of software company OScar
Mario Merz (1925–2003), Italian artist
Marisa Merz (b. 1928), Italian sculptor, widow of Mario Merz
Matthias Merz (b. 1984), Swiss mountaineer
Michael Merz (b. 1979), US boxer
Mischa Merz (b. 1967), Australian boxer, painter, journalist
Otto Merz (1889-1933), German racecar driver
Robert Merz (1887-1914), Austrian football (soccer) player
Sue Merz (b. 1972), US ice hockey player, Olympic athlete (1998)
William Merz (1878-1946), US gymnast, Olympic athlete (1904)