Roman historian and politician Tacitus referred to Jesus, his execution by Pontius Pilate, and the existence of early Christians in Rome in his final work, Annals (written c. AD 116), book 15, chapter 44. The context of the passage is the six-day Great Fire of Rome that burned much of the city in AD 64 during the reign of Roman Emperor Nero. The passage is one of the earliest non-Christian references to the origins of Christianity, the execution of Christ described in the canonical gospels, and the presence and persecution of Christians in 1st-century Rome.

There are two points of vocabulary in the passage. First, Tacitus may have used the word "Chrestians" (Chrestianos) for Christians, but then speaks of "Christ" (Christus) as the origin of that name. Second, he calls Pilate a "procurator", even though other sources indicate that he had the title "prefect". Scholars have proposed various hypotheses to explain these peculiarities. The scholarly consensus is that Tacitus's reference to the execution of Jesus by Pontius Pilate is both authentic, and of historical value as an independent Roman source. However, Tacitus does not reveal the source of his information. There are several hypotheses as to what sources he may have used.

Tacitus provides non-Christian confirmation of the crucifixion of Jesus. Scholars view it as establishing three separate facts about Rome around AD 60: (i) that there were a sizable number of Christians in Rome at the time, (ii) that it was possible to distinguish between Christians and Jews in Rome, and (iii) that at the time pagans made a connection between Christianity in Rome and its origin in Roman Judaea. Tacitus is one of the non-Christian writers of the time who mentioned Jesus and early Christianity along with Flavius Josephus, Pliny the Younger, and Suetonius.

The Annals passage (15.44), which has been subjected to much scholarly analysis, follows a description of the six-day Great Fire of Rome that burned much of Rome in July 64 AD. The key part of the passage reads as follows (translation from Latin by A. J. Church and W. J. Brodribb, 1876):

Sed non ope humana, non largitionibus principis aut deum placamentis decedebat infamia, quin iussum incendium crederetur. ergo abolendo rumori Nero subdidit reos et quaesitissimis poenis adfecit, quos per flagitia invisos vulgus Chrestianos appellabat. auctor nominis eius Christus Tibero imperitante per procuratorem Pontium Pilatum supplicio adfectus erat; repressaque in praesens exitiabilis superstitio rursum erumpebat, non modo per Iudaeam, originem eius mali, sed per urbem etiam, quo cuncta undique atrocia aut pudenda confluunt celebranturque. igitur primum correpti qui fatebantur, deinde indicio eorum multitudo ingens haud proinde in crimine incendii quam odio humani generis convicti sunt.

But all human efforts, all the lavish gifts of the emperor, and the propitiations of the gods, did not banish the sinister belief that the conflagration was the result of an order. Consequently, to get rid of the report, Nero fastened the guilt and inflicted the most exquisite tortures on a class hated for their abominations, called Christians by the populace. Christus, from whom the name had its origin, suffered the extreme penalty during the reign of Tiberius at the hands of one of our procurators, Pontius Pilatus, and a most mischievous superstition, thus checked for the moment, again broke out not only in Judæa, the first source of the evil, but even in Rome, where all things hideous and shameful from every part of the world find their centre and become popular. Accordingly, an arrest was first made of all who pleaded guilty; then, upon their information, an immense multitude was convicted, not so much of the crime of firing the city, as of hatred against mankind.

Tacitus then describes the torture of Christians:

Mockery of every sort was added to their deaths. Covered with the skins of beasts, they were torn by dogs and perished, or were nailed to crosses, or were doomed to the flames and burnt, to serve as a nightly illumination, when daylight had expired. Nero offered his gardens for the spectacle, and was exhibiting a show in the circus, while he mingled with the people in the dress of a charioteer or stood aloft on a car. Hence, even for criminals who deserved extreme and exemplary punishment, there arose a feeling of compassion; for it was not, as it seemed, for the public good, but to glut one man's cruelty, that they were being destroyed.