Shoghí Effendí Rabbání (March 1, 1897 - November 4, 1957), better known as Shoghi Effendi, was the Guardian and appointed head of the Bahá'í Faith from 1921 until his death in 1957.

Future hereditary Guardians were permitted in the Bahá'í scripture by appointment from one to the next, but a prerequisite that appointees be male descendants of Bahá'u'lláh left no suitable living candidates, and Shoghi Effendi died without making an appointment. To Bahá'ís he is the first and last Guardian of the Faith.