"Render unto Caesar" is the beginning of a phrase attributed to Jesus in the synoptic gospels, which reads in full, "Render unto Caesar the things that are Caesar's, and unto God the things that are God's" (Ἀπόδοτε οὖν τὰ Καίσαρος Καίσαρι καὶ τὰ τοῦ Θεοῦ τῷ Θεῷ).

This phrase has become a widely quoted summary of the relationship between Christianity, secular government, and society. The original message, coming in response to a question of whether it was lawful for Jews to pay taxes to Caesar, gives rise to multiple possible interpretations about the circumstances under which it is desirable for Christians to submit to earthly authority.

All three synoptic gospels state that hostile questioners tried to trap Jesus into taking an explicit and dangerous stand on whether Jews should or should not pay taxes to the Roman authorities. The accounts in Matthew 22:15–22 and Mark 12:13–17 say that the questioners were Pharisees and Herodians, while Luke 20:20–26 says only that they were "spies" sent by "teachers of the law and the chief priests".

They anticipated that Jesus would oppose the tax, as their purpose was "to hand him over to the power and authority of the governor". The governor was Pilate, and he was the man responsible for the collecting of taxes in Roman Judea. Initially the questioners flattered Jesus by praising his integrity, impartiality, and devotion to truth. Then they asked him whether or not it is right for Jews to pay the taxes demanded by Caesar. In the Gospel of Mark the additional, provocative question is asked, "Should we pay or shouldn't we?"

Jesus first called them hypocrites, and then asked one of them to produce a Roman coin that would be suitable for paying Caesar's tax. One of them showed him a Roman coin, and he asked them whose head and inscription were on it. They answered, "Caesar's," and he responded: "Render therefore unto Caesar the things which are Caesar's, and unto God the things that are God's".

Matthew 22:22 states that they "marvelled" (ἐθαύμασαν); unable to trap him any further, and being satisfied with the answer, they went away.

A similar episode occurs in the apocryphal Gospel of Thomas (verse 100), but there the coin in question is gold. Importantly, in this non-canon gospel, Jesus adds, "and give me what is mine." The same episode occurs in a fragment of the also apocryphal Egerton Gospel: Jesus is asked whether it is right to pay taxes to the rulers (i.e. the Romans), to which he becomes indignant and criticizes the questioners by quoting the Book of Isaiah; the fragment is interrupted immediately after that.

The text identifies the coin as a δηνάριον (dēnarion), and it is usually thought that the coin was a Roman denarius with the head of Tiberius. The coin is also called the "tribute penny." The inscription reads "Ti[berivs] Caesar Divi Avg[vsti] F[ilivs] Avgvstvs" ("Caesar Augustus Tiberius, son of the Divine Augustus"). The reverse shows a seated female, usually identified as Livia depicted as Pax.