Marquardt is a surname of German origin. Notable people with the surname include:
August F. Marquardt (1850–1925), American politician
Bridget Marquardt (born 1973), American television personality, glamour model, and actress
Christel Marquardt, judge on the Kansas Court of Appeals
Christiane Marquardt (born 1958), retired East German sprinter
Darcy Marquardt (born 1979), Canadian rower
David Marquardt, co-founder of venture capital firm August Capital
Donald Marquardt (1929–1997), American statistician
Elizabeth Marquardt, author of Between Two Worlds: The Inner Lives of Children of Divorce
Heinz Marquardt (1922–2003), German Luftwaffe fighter ace
Joachim Marquardt (1812–1882), German historian and writer on Roman antiquities
Markus Marquardt (born 1970), German operatic baritone
Mike Marquardt (born 1982), American football defensive tackle
Nate Marquardt (born 1979), American mixed martial artist
Ollie Marquardt (1902–1968), infielder in Major League Baseball
R. Niels Marquardt (born 1953), American diplomat
Stephen R. Marquardt, American surgeon