The Athanasian Creed (Quicumque vult) is a Christian statement of belief, focusing on Trinitarian doctrine and Christology. The Latin name of the creed, Quicumque vult, is taken from the opening words, "Whosoever wishes." The Athanasian Creed has been used by Christian churches since the sixth century. It is the first creed in which the equality of the three persons of the Trinity is explicitly stated, and differs from the Nicene-Constantinopolitan and Apostles' Creeds in the inclusion of anathemas, or condemnations of those who disagree with the Creed (like the original Nicene Creed).

Widely accepted among Western Christians, including the Roman Catholic Church, the Anglican Communion, the Lutheran Church and most liturgical Protestant denominations, the Athanasian Creed has been used in public worship less and less frequently. The creed has never gained much acceptance in liturgy among Eastern Christians.

A medieval account credited Athanasius of Alexandria, the famous defender of Nicene theology, as the author of the Creed. According to this account, Athanasius composed it during his exile in Rome, and presented it to Pope Julius I as a witness to his orthodoxy. This traditional attribution of the Creed to Athanasius was first called into question in 1642 by Dutch Protestant theologian G.J. Voss, and it has since been widely accepted by modern scholars that the creed was not authored by Athanasius. Athanasius' name seems to have become attached to the creed as a sign of its strong declaration of Trinitarian faith. The reasoning for rejecting Athanasius as the author usually relies on a combination of the following:

Athanasius of Alexandria (Greek: Ἀθανάσιος, Athanásios) (b. ca. 296-298 – d. 2 May 373), also referred to as St. Athanasius the Great, St. Athanasius I of Alexandria, St Athanasius the Confessor and (primarily in the Coptic Orthodox Church) St Athanasius the Apostolic, was the 20th bishop of Alexandria. His episcopate lasted 45 years (c. 8 June 328 - 2 May 373), of which over 17 were spent in five exiles ordered by four different Roman emperors. He is considered to be a renowned Christian theologian, a Church Father, the chief defender of Trinitarianism against Arianism, and a noted Egyptian leader of the fourth century.

He is remembered for his role in the conflict with Arius and Arianism. In 325, at the age of 27, Athanasius had a leading role against the Arians in the First Council of Nicaea. At the time, he was a deacon and personal secretary of the 19th Bishop of Alexandria, Alexander. Nicaea was convoked by Constantine I in May–August 325 to address the Arian position that Jesus of Nazareth is of a distinct substance from the Father.