Gaius Norbanus Flaccus was a Roman politician and general during the 1st century BC. Of Etruscan descent, Flaccus was the grandson of Gaius Norbanus. His family had suffered under the proscriptions of Lucius Cornelius Sulla, but had found favour under the regime of Julius Caesar. With Caesar's death, his allegiance passed to Octavianus, Caesar's adopted son. Norbanus was married to a daughter of Lucius Cornelius Balbus the Younger and had at least one son, also named Gaius Norbanus Flaccus.