Arc, Religious administrative complex on Mount Carmel, Haifa, Israel.

The Arc is a group of administrative buildings on Mount Carmel in Haifa, Israel, including the Seat of the Universal House of Justice, the Seat of the International Teaching Centre, the International Archives, and the Centre for the Study of the Sacred Texts. A fifth building, the International Baháʼí Library, is planned. The buildings are linked by an underground passage and include bomb shelters.

Construction of the complex began in the mid-20th century when the Archives Building was completed as the first structure, storing original manuscripts from faith founders. The project expanded over subsequent decades to create the current five-building ensemble.

The Arc takes its name from Bahá'u'lláh's Tablet of Carmel, which speaks of God sailing His Ark on Mount Carmel; Shoghi Effendi read this as the founding of the Universal House of Justice and laid the institutions out on a curve. The fulcrum is the Monument Gardens, holding graves of members of the holy family. The International Archives keeps the sword of Mullá Husayn, photographs of Bahá'u'lláh and a painting of the Báb.

The Arc buildings stand on the slopes of Mount Carmel above the German Colony, with the Monument Gardens at the centre of the curve. The complex is reached on foot along the hillside paths; the buildings are linked by an underground passage and include bomb shelters required by law. The International Baháʼí Library, the fifth building planned for the Arc, has not been built.

The Arc's buildings echo classical temples: the International Archives has fifty Ionic columns, and the Seat of the Universal House of Justice is ringed by fifty-eight Corinthian ones. Shoghi Effendi based the Archives on the Parthenon. An underground passage links the buildings, which also contain bomb shelters required by law.