Riḍván (Arabic: رضوان‎ Riḍwán; Persian transliteration: Riḍván, Persian pronunciation: [ɾezvɒːn]) is a twelve-day festival in the Bahá'í Faith, commemorating the commencement of Bahá'u'lláh's prophethood. It begins at sunset on April 20 and continues until sunset, May 2. On the first (April 21), ninth (April 29) and twelfth days of Ridván (May 2), work and schooling should be suspended.

"Ridván" means paradise, and is named for the Garden of Ridván, outside Baghdad where Bahá'u'lláh stayed for twelve days after the Ottoman Empire exiled him from Baghdad and before commencing his journey to Constantinople.

It is the most holy Bahá'í festival, and is also referred to as the "Most Great Festival" and the "King of Festivals".

In 1844 Siyyid `Alí-Muhammad of Shiraz proclaimed that he was "The Báb" (Arabic: "The Gate"‎), after a Shi'a religious concept. His followers were therefore known as Bábís. The Báb's writings introduced the concept of "He whom God shall make manifest", a Messianic figure whose coming, according to Bahá'ís, was announced in the scriptures of all of the world's great religions.