C •
Charles Mertens (1862–1919), Belgian painter, printmaker and illustrator •
Christian Mertens (born 1991), German politician •
Claas Mertens (born 1992), German rower •
Conner Mertens (born ca. 1994), American football player
D •
Dries Mertens (born 1987), Belgian footballer •
Dylan Mertens (born 1995), Dutch footballer
E •
Elise Mertens (born 1995), Belgian tennis player •
Els Mertens (born 1966), Belgian racing cyclist •
Ewald Mertens (1909–1965), German middle-distance runner
F •
Frank Mertens (born 1961), German keyboardist and composer •
Franz Mertens (1840–1927), German mathematician •
Mertens conjecture,
Mertens function,
Mertens' theorems, and
Meissel–Mertens constant •
Franz Carl Mertens (1764–1831), German botanist
G •
Gregory Mertens (1991–2015), Belgian footballer
H •
Helmut Mertens (1917–1984), German fighter ace
J •
Jan Mertens the Younger (died ca. 1527), South Netherlandish painter •
Jan Mertens (1904–1964), Belgian cyclist. •
Jan Mertens (1916–2000), Dutch politician •
Jan Mertens (born 1995), Belgian footballer •
Jean-François Mertens (1946–2012), Belgian game theorist known •
Mertens-stable equilibrium,
Mertens' voting game •
Jerry Mertens (born 1936), American football cornerback •
Jim Mertens (born 1947), American football player •
John J. Mertens (1869 – >1924), South Dakota politician •
Joseph Mertens (1921–2007), Belgian archaeologist
K •
Karl Heinrich Mertens (1796–1830), German botanist and naturalist •
Klaus Mertens (born 1949), German bass singer •
Klaus Mertens (born 1950), German artist
L •
Lennart Mertens (born 1992), Belgian footballer •
Linda Mertens (born 1978), Belgian singer •
Lothar Mertens (1959–2006), German historian
M •
Michael Mertens (born 1965), German shot putter
P •
Peter Mertens (born 1969), Belgian author and politician •
Pierre Mertens (1939–2025), Belgian-French writer and lawyer •
Pieter Mertens (born 1980), Belgian road bicycle racer • Peter Mertens (born 1944) Canadian politician • Paul Mertens (born 1957) Songwriter and creator of Pitti Polak
R •
René Mertens (1922–2014), Belgian racing cyclist •
Robert Mertens (1894–1975), German herpetologist •
Mertens' water monitor •
Robert Mertens's day gecko S •
Sibylle Mertens-Schaaffhausen (1797–1857), German art collector and musician •
Stéphane Mertens (born 1959), Belgian motorcycle road racer
T •
Thomas Mertens (
fl. 1666–1669, Flemish still life painter •
Tim Mertens (born 1986), Belgian racing cyclist
W •
W. Mertens (
fl. 1650–1675), Flemish still life painter •
Wim Mertens (born 1953), Belgian musician
Y •
Yannick Mertens (born 1987), Belgian tennis player
Z •
Zenia Mertens (born 2001), Belgian footballer ==Fictional characters==