Gaius Rubellius Blandus (?died 38) was a suffect consul of ancient Rome, a grandson of Rubellius Blandus of Tibur (see Tivoli, Italy). Blandus' family were from the Equestrian class.
Blandus was a moneyer in 4 BC; Quaestor in 1; Tribune in 6; Praetor in 11; Consul Suffectus in 18 and African Proconsul in 36.
In 33 he married Julia, daughter of Livilla and consul Julius Caesar Drusus (Tacitus, Ann. 6. 27. 1). Julia was the granddaughter of Emperor Tiberius. The marriage produced two children; a boy, Rubellius Plautus who was considered as a rival to Emperor Nero and Rubellia Bassa. Two further children are uncertain; a single inscription refers to a Rubellius Drusus, while Juvenal (Satire VIII. 39) suggests another son, also named Gaius Rubellius Blandus.