Unity of religion is a core teaching of the Baháʼí Faith which states that there is a fundamental unity in many of the world's religions. The principle states that the teachings of the major religions are part of a single plan directed from the same God. It is one of the core teachings of the Baháʼí Faith, alongside the unity of God, and the unity of humanity.

The Baháʼí Faith is a religion founded in the 19th century that teaches the essential worth of all religions and the unity of all people. Established by Baháʼu'lláh, it initially developed in Iran and parts of the Middle East, where it has faced ongoing persecution since its inception. The religion is estimated to have 5 to 8 million adherents, known as Baháʼís, spread throughout most of the world's countries and territories.