Rupert Maas (born 1960) is an English painting specialist and gallery owner, known for his numerous media and television appearances.
Maas was born in 1960. His father, Jeremy Maas, started the Maas Gallery in Mayfair, London, dealing in Pre-Raphaelite paintings, writing a book in 1969, Victorian Painters. Rupert Maas was educated at Sherborne School in Dorset from 1974 to 1978, and took a BA in Art History at the University of Essex from 1980 to 1983.
In the summer of 1983 he sailed the Atlantic and later that year joined the Maas Gallery. In 1997, following the death of his father, Maas became director of the gallery, which deals in Victorian, Pre-Raphaelite, Romantic and Modern British paintings, watercolours, drawings, reproductive engravings and sculpture. The gallery has also featured the work of a number of contemporary living artists, including Keiron Leach and Julia Sorrell.
Maas served on the executive committee of the Society of London Art Dealers in 1998–99. He co-owns and runs The Watercolours and Drawings Fair. He has regularly written articles for the arts press and lectures on art. He is widely recognised as the leading expert on the works of the Royal Academician Augustus Leopold Egg (1816–1863). He also promotes Ballantine's whisky in the Far East.
Maas is frequently called upon to provide independent valuations for museums, both domestic and international, and has previously valued individual pictures and entire collections (for example the John Wharlton Bunney 1828-1882 archive) for Acceptance in Lieu. In 2006 Maas was duped into paying £20,000 for a faked art work claimed to be by fairyland painter John Anster Fitzgerald (1823–1906).