British Museum

The British Museum (大英博物館), also known as the Arsenal (アーセナル), is a museum in London. It is widely considered to be one of the world's greatest museums of human history and culture. Its permanent collection, numbering some eight million works, is amongst the finest, most comprehensive, and largest in existence and originates from all continents, illustrating and documenting the story of human culture from its beginnings to the present. The British Library was originally a department of the British Museum and from the mid-19th century occupied the famous circular British Museum Reading Room. It became legally separate in 1973, and by 1997 had moved into its new purpose-built building at St Pancras, London.

In Toaru Majutsu no Index it is a museum found in London, England, where precious artifacts and works of art are kept. Religious artifacts, such as a facsimile of the Croce di Pietro are present, as well as magic artifacts such as grimoires, and the Union Jack, where caretakers have no idea of their true purpose.

In Toaru Majutsu no Index
Charles Conder is the highest authority on Archaeology, and is the keeper of the museum. He manages and restores the items inside the museum. Due to his knowledge and skill and restoration, he often finds himself working for authorities when it comes to magic side items, such as the Croce di Pietro and Union Jack, for Laura Stuart and Queen Elizard respectively. Among the items that he and the workers process through, there are a few magical items. However, the people working at the British Museum are ordinary people who have nothing to do with magic. Furthermore, the Anglican Church provides theological, religious, and ethical advice on items to the museum. Sherry Cromwell also aids in artistic identification for the museum, and Stiyl Magnus is one of the people entrusted in managing the magical items found there.

Along with Louvre, the Vatican Museums, the ruins of Pataliputra, the ancient city of Compiègne, and Mont-Saint-Michel Abbey, the museum is the home to several grimoires that Index has read.

Daihasei Festival Arc
Charles Conder of the British Museum is tasked by Laura Stuart to aide the Church in knowing the truth about the Stab Sword, and allowed the Church to borrow a replica from the museum. It was he, who revealed to Laura Stuart, the true nature of the sword, which was in fact the Croce di Pietro.

Toaru Majutsu no Index SS: Necessarius Special Admission Test
Due to the destruction of the Pound Economy's magical foundation, Queen Elizard contacted the Museum and had them prepare back-up data from the spiritual items stored within it, in order to assist with the recovery. However the data transmission was intercepted by Cynthia Exment and downloaded into her staff, allowing her to replicate the Museum's spiritual item arsenal. She then attempted to destroy the Museum itself, but was stopped outside it by Itsuwa.

British Royal Family Arc
Despite London turning into a battlefield, British Museum apparently survives, and is intact enough for Charles Conder to remain working. Under the orders of the Queen of England, Elizard, Charles Conder secretly works to prepare the Union Jack, a magic artifact that helps in turning the tide of war into the Queen and her allies' favor against Carissa.