Tiberius Avidius Quietus (died by 107) is a Roman politician who lives between the 1st century and the 2nd century.

Quietus comes from a wealthy, distinguished and well connected political family in Faventia (modern Faenza, Italy).

Quietus has a brother called Gaius Avidius Nigrinus, has two nephews (a younger Gaius Avidius Nigrinus and Titus Avidius Quietus) and is a great paternal uncle to Roman Emperor Hadrian's daughter-in-law Avidia Plautia.

Quietus and his family may have been related to the consul Gaius Petronius Pontius Nigrinus, who had served his consulship at the time that the Roman Emperor Tiberius had died in 37.