Marcus Aurelius, Roman Emperor from 161 to his death

Marcus Junius Brutus, Roman patrician of the late Roman Republic

G. B. Markus, developmental psychologst who wrote the birth order theory with R. B. Zajonc.

Marcus Vipsanius Agrippa, Roman statesman and general

Neiman Marcus, upscale, specialty, retail department store

Marcus Licinius Crassus, Roman general and politician who suppressed the slave revolt led by Spartacus

Greil Marcus, American author

Rudolph Marcus, chemist and Nobel Prize winner.

Markus Naslund, NHL player

Marcus Cor Von, Wrestler

Marcus Tullius Cicero (character of Rome), historical figure who features as a character in the HBO/BBC2 original television series Rome

Marcus (given name)

David Daniel "Mickey" Marcus (1901-1948), American jurist and colonel

Marcus Allbäck, Swedish footballer

Siegfried Marcus (1831-1898), German-Austrian inventor

Louis Marcoussis, former name Ludwik Kazimierz Wladyslaw Markus, Polish-born French painter and engraver

Marcus, Iowa

Markus Niemelä, Finnish racing driver

Marcus, Washington

Louise Markus, Australian politician

Jacob Rader Marcus, US reform rabbi

Marcus (usurper), a usurper emperor from Roman Britain in AD 406

Rixi Markus, British bridge player

Markus Ruby, European brand of watches

György Márkus, Hungarian philosopher

Leo Markus, fictional character on the American sitcom Will & Grace

Marcus Cole, fictional character in Babylon 5

Markus Jakobsson, Swedish computer security researcher and entrepreneur