The Pharisees (; Hebrew: פְּרוּשִׁים, romanized: Pərūšīm) were a Jewish social movement and a school of thought in the Levant during the time of Second Temple Judaism. After the destruction of the Second Temple in 70 CE, Pharisaic beliefs became the foundational, liturgical, and ritualistic basis for Rabbinic Judaism.

Conflicts between Pharisees and Sadducees took place in the context of much broader and longstanding social and religious conflicts among Jews, made worse by the Roman conquest. One conflict was cultural, between those who favored Hellenization (the Sadducees) and those who resisted it (the Pharisees). Another was juridical-religious, between those who emphasized the importance of the Temple with its rites and services, and those who emphasized the importance of other Mosaic Laws. A specifically religious point of conflict involved different interpretations of the Torah and how to apply it to current Jewish life, with Sadducees recognizing only the Written Torah and rejecting Prophets, Writings, and doctrines such as the Oral Torah and the resurrection of the dead.

Josephus (c. 37 – c. 100 CE), believed by many historians to have been a Pharisee, estimated the total Pharisee population before the fall of the Second Temple to be around 6,000. He claimed that the Pharisees’ influence over the common people was so great that anything they said against the king or the high priest was believed, apparently in contrast to the more elite Sadducees, who were the upper class. Pharisees claimed Mosaic authority for their interpretation of Jewish religious law, while Sadducees represented the authority of the priestly privileges and prerogatives established since the days of Solomon, when Zadok, their ancestor, officiated as high priest.

Pharisees are notable by the numerous references to them in the New Testament. While the writers record hostilities between the Pharisees and Jesus, they also reference Pharisees who believed in him, including Nicodemus, who said it is known that Jesus is a teacher sent from God, also Joseph of Arimathea, who was a disciple, and an unknown number of "those of the party of the Pharisees who believed", among them the Apostle Paul – a student of Gamaliel, who warned the Sanhedrin that opposing the disciples of Jesus could prove to be tantamount to opposing God – even after becoming an apostle of Jesus.