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Flaccus was a cognomen of the ancient Roman plebeian family Fulvius, considered one of the most illustrious gentes of the city. Cicero and Pliny the Elder state that the family was originally from Tusculum, and that members still lived there in the 1st century.

As usual for cognomina, "Flaccus" was likely originally a nickname, probably of Marcus Fulvius Flaccus, the founder of the family. The etymology of "Flaccus" is unknown, but it is similar to other adjectives describing deformities of the body, like brocc(h)us (buck-toothed), lippus (blear-eyed), etc.^[1] It has been variously interpreted as meaning "big ears", "flop ears", "lop-eared",^[2] "floppy", or "fatty".

Flaccus was also a cognomen for a branch of the patrician Valerii and others.

Fulvii

Marcus Fulvius Flaccus, consul 264 BC
Quintus Fulvius M.f. Flaccus, consul 237 BC, 224 BC, 212 BC, 209 BC
Gnaeus Fulvius Flaccus, brother of Q. Fulvius, convicted of cowardice against Hannibal in 212 BC and exiled to Tarquinii
Q. Fulvius Cn.f. Flaccus, suffect consul 180 BC
Quintus Fulvius Q.f. Flaccus, consul 179 BC
Servius Fulvius Flaccus, consul 135 BC
Gaius Fulvius Flaccus, consul 134 BC
Marcus Fulvius Flaccus, consul 125 BC, ally of the Gracchi

Valerii

Lucius Valerius M.f. Flaccus, consul 261 BC
Publius Valerius L.f. Flaccus, consul 227 BC
Lucius Valerius Flaccus, consul with Cato 195 BC
Lucius Valerius Flaccus, consul 152 BC
Lucius Valerius Flaccus, consul 131 BC
Lucius Valerius Flaccus, consul 100 BC
Lucius Valerius Flaccus, suffect consul 86 BC
Gaius Valerius Flaccus, consul 93 BC
Lucius Valerius Flaccus, urban praetor 63 BC
Gaius Valerius Flaccus (1st century), poet

Others

Flaccus, original tibicen for the works of Terence (fl. 166–160 BC)
Quintus Horatius Flaccus (Horace)
Gaius Norbanus Flaccus (consul 38 BC), consul 38 BC
Gaius Norbanus Flaccus (consul 24 BC), consul 24 BC
Gaius Norbanus Flaccus (consul 15 AD), consul 15 AD
Marcus Verrius Flaccus, freedman scholar
Lucius Pomponius Flaccus, consul AD 17
Aulus Avilius Flaccus, prefect of Egypt AD 32, written about by Philo
Aulus Persius Flaccus (34-62), poet
Marcus Hordeonius Flaccus, commander of the Rhine legions during the Batavian rebellion, killed AD 70
C. Bellicius Flaccus Torquatus Tebanianus, ordinary consul 124
C. Bellicius Flaccus Torquatus, ordinary consul 143, and son of the consul of 124.
Quintus Volusius Flaccus Cornelianus, consul 174
Alcuin, nicknamed "Flaccus"