The Bahá'í Faith is a religion founded by Bahá'u'lláh in 19th century Persia. Bahá'ís number around 6 million in more than 200 countries around the world.

According to Bahá'í teachings, religious history is seen as an evolving educational process for mankind, through God's messengers, which are termed Manifestations of God. Bahá'u'lláh is seen as the most recent, pivotal, but not final of these individuals. He claimed to be the expected redeemer and teacher prophesied in Judaism, Christianity, Islam, Hinduism, Buddhism, and other religions, and that his mission was to establish a firm basis for unity throughout the world, and inaugurate an age of peace and justice, which Bahá'ís expect will inevitably arise.

"Bahá'í" (/baˈhaːʔiː/) can be an adjective referring to the Bahá'í Faith, or the term for a follower of Bahá'u'lláh (Bahá'í is not a noun meaning the religion as a whole). The term comes from the Arabic word Bahá’ (بهاء), meaning "glory" or "splendor".