Saint Gall or Gallus (c. 550 – c. 646), Irish monk
Gallus Anonymus, 12th-century Polish historian
Agnes Gallus, (1930–2010), Hungarian Canadian artist
Gallus (bishop of Transylvania), 13th-century Hungarian prelate
Gallus Mag, 19th-century female bouncer at a New York bar
Georg Gallus (1927–2021), German politician
Chris Gallus (born 1943), Australian politician
Thomas Gallus (c. 1200–1246), French theologian
Jacobus Gallus (1550–1591), Slovene composer
Nicolaus Gallus (c. 1516–1570), German Lutheran Reformer
Sandor Gallus (1907–1996), Australian archaeologist
Aelius Gallus, Roman prefect of Egypt
Constantius Gallus (326–354), junior Roman emperor from 351 to 354
Cornelius Gallus (c. 70–26 BC), Roman poet, orator and politician
Quintus Roscius Gallus (c. 126–62 BC), Roman actor
Trebonianus Gallus (206–253), Roman emperor
Romans
Aelius Gallus, Roman prefect of Egypt
Constantius Gallus (326–354), junior Roman emperor from 351 to 354
Cornelius Gallus (c. 70–26 BC), Roman poet, orator and politician
Quintus Roscius Gallus (c. 126–62 BC), Roman actor
Trebonianus Gallus (206–253), Roman emperor
Animal-related
Gallus (bird), a genus of birds including junglefowl and domestic chickens
Gallus Lacepède, 1802, a synonym for the fish genus Alectis
Gallus (constellation), the cockerel, an obsolete constellation
Other
Gallus, the singular form of Galli, the eunuch priests of the Phrygian goddess Cybele
Gallus (album), 1992 album by Scottish rock band Gun
Gallus (Frankfurt am Main), a district of Frankfurt, Germany
Gallus (professional wrestling), a Scottish professional wrestling stable