Opus Dei, formally known as The Prelature of the Holy Cross and Opus Dei (Latin: Praelatura Sanctae Crucis et Operis Dei), is an institution of the Roman Catholic Church that teaches that everyone is called to holiness and that ordinary life is a path to sanctity. The majority of its membership are lay people, with secular priests under the governance of a prelate (bishop) elected by specific members and appointed by the Pope. Opus Dei is Latin for Work of God; hence the organization is often referred to by members and supporters as the Work.

Founded in Spain in 1928 by the Catholic saint and priest Josemaría Escrivá, Opus Dei was given final Catholic Church approval in 1950 by Pope Pius XII. In 1982, by decision of Pope John Paul II, the Catholic Church made it into a personal prelature—that is, the jurisdiction of its own bishop covers the persons in Opus Dei wherever they are, rather than geographical dioceses.

As of 2014, members of the Prelature numbered 93,100. Lay persons, men and women, numbered 91,020 while there were 2,080 priests. These figures do not include the diocesan priest members of Opus Dei's Priestly Society of the Holy Cross, estimated to number 2,000 in the year 2005. Members are in more than 90 countries. About 70 per cent of Opus Dei members live in their private homes, leading traditional Catholic family lives with secular careers, while the other 30 per cent are celibate, of whom the majority live in Opus Dei centres. Opus Dei organizes training in Catholic spirituality applied to daily life. Aside from personal charity and social work, Opus Dei members are involved in running universities, university residences, schools, publishing houses, and technical and agricultural training centers.

Opus Dei is the third studio album by Laibach, released in 1987. It features "Geburt einer Nation" ("birth of a nation"), a German cover of Queen's "One Vision", and two reworkings of the Austrian band Opus' sole hit single "Live Is Life". The Opus song became the German language "Leben heißt Leben" and the English language "Opus Dei". "The Great Seal" is the national anthem of the NSK State, the lyrics taken from Churchill's speech We shall fight on the beaches. A new arrangement of the song appears on Laibach's album Volk, with the title "NSK". On Volk, the song is credited to Laibach and Slavko Avsenik, Jr.

There are two further connections with Queen's A Kind of Magic album. Although the drum loop in "Trans-National" is near identical to that in Queen's "Don't Lose Your Head", it is composed in fact from samples from the introduction musical theme from the movie Battle of Neretva, composed by Bernard Herrmann. The elements of "How the West Was Won" (specifically the rhythm and harmonised guitars) are inspired by Queen's "Gimme The Prize".

Opus Dei is a prelature of the Catholic Church.

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