Montagu House or Montague House may refer to:
England Montagu House, Bloomsbury, former mansion that became first home of the British Museum, also known as Montague House, since demolished (a slang term for British Museum, on Great Russell Street, London, on site of former mansion) Montagu House, Portman Square, built for Elizabeth Montagu on Portman Square Montagu House, Whitehall, another London mansion Montagu House, Blackheath
United States Henry Montague House, Kalamazoo, Michigan, listed on the National Register of Historic Places
Australia Monty House (Montague Grant House, born 1946), Western Australian politician
See also Montacute House Montague (disambiguation) Montagu (disambiguation)