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The interiors of the building were largely destroyed by the building's conversion into an art gallery but the interiors of the chapel and main hall are still intact. The chapel which is expressed externally by a huge round headed window which breaks through the cornice line is the most elaborate. The interior of the chapel is finely carved in oak by the immigrant Huguenot craftsman James Tarbury. There is a fine wooden surround to the main window with tiers of classical columns. The ceiling in the chapel was replaced in Victorian times and is made of papier mache and not fine plaster as it appears. It is a hugely elaborate work with cherubs and angels.

The Dining Room which is placed centrally along the right hand side in the plan above is a more restrained room. Of huge proportions, the only decoration is a prominent cornice and portraits of former Lord Lieutenants. The remainder of the interiors were less elaborate but there is an impressive series of vaults below the building. Taken with the series of arcades around the quadrangle, there is very much a monastic air to the Royal Hospital which leaves it as a ocean of calm within the city.