Gaius Claudius Marcellus Minor was a Roman Senator and Consul. He was a member of the distinguished Claudii family. He was a friend to Roman Senator Cicero and an early opponent of Julius Caesar.

In 54 BC the great-uncle of Octavia, Julius Caesar was said to be anxious for Octavia to divorce Marcellus so that she could marry Pompey, his rival and son-in-law who had just lost his wife Julia (daughter of Caesar and thus Octavia's cousin once removed). However, Pompey apparently declined the proposal and Octavia's husband continued to oppose Julius Caesar, culminating in the crucial year of his consulship in 50 BC when he tried to recall Julius Caesar from his ten-year governorship in Gaul two years early, without his army, in an attempt to save the Roman Republic. Failing this, he called unsuccessfully upon Caesar to resign.

He also obstructed Caesar from standing for a second consulship in absentia, insisting that he should return to Rome to stand, thereby forgoing the protection of his armies in Gaul. When Caesar finally invaded Italy in 49 BC, Marcellus, unlike his brother and nephew, did not take up arms against him. Caesar subsequently pardoned him.

In 47 BC, he was able to intercede with Caesar for his cousin and namesake Gaius Claudius Marcellus Maior, a former consul of 49 BC, then living in exile. He died in May 40 BC; five months later, his wife, Octavia, married the Roman Triumvir Mark Antony.

Spouses and children:

Married in -65 to ... ... with
F Claudia av CLAUDII -64--15

Married in -54 to Octavia av OCTAVII -69--11 with
M Marcellus av CLAUDII -42--23
F Marcella Major av CLAUDII -41-0
F Marcella Minor av CLAUDII -40-25

Gift med
Octavia av Octavii, född -69 i Nola, Campania, Italien, död -11 i Roma, Lazio, Italien.

Barn:
Marcella Minor av Claudii, född -40, död 25

Barn:
Claudia av Claudii, född -64, död -15