The Watch Tower Bible and Tract Society of Pennsylvania is a non-stock, not-for-profit organization headquartered in Warwick, New York. It is the main legal entity used worldwide by Jehovah's Witnesses to direct, administer and disseminate doctrines for the group and is often referred to by members of the denomination simply as "the Society". It is the parent organization of a number of Watch Tower subsidiaries, including the Watchtower Society of New York and International Bible Students Association. The number of voting shareholders of the corporation is limited to between 300 and 500 "mature, active and faithful" male Jehovah's Witnesses. About 5,800 Jehovah's Witnesses provide voluntary unpaid labour, as members of a religious order, in three large Watch Tower Society facilities in New York. Nearly 15,000 other members of the order work at the Watch Tower Society's other facilities worldwide.

Jehovah's Witnesses is a nontrinitarian, millenarian, restorationist Christian denomination. As of 2023, the group reported approximately 8.6 million members involved in evangelism, with around 20.5 million attending the annual Memorial of Christ's death. Jehovah's Witnesses believe that the destruction of the present world system at Armageddon is imminent, and the establishment of God's kingdom over earth is the only solution to all of humanity's problems.