Rupert Nicholas Maas (born 23 July 1960)[1] is an English painting specialist and gallery owner best known for his appearances on the long-running BBC One series Antiques Roadshow where he has been a member of the team of experts since 1997.

Born and raised in London, Rupert is the middle of three children and the oldest son of the art dealer Jeremy Maas (1928–1997) and artist and equestrian Antonia Armstrong Willis (1932–2017).

[3][4] Rupert's father started the Maas Gallery in Mayfair, London, dealing in Pre-Raphaelite paintings, writing a book in 1969, Victorian Painters.

[6] In the summer of 1983, he sailed the Atlantic and later that year joined the Maas Gallery which deals in Victorian, Pre-Raphaelite, Romantic and Modern British paintings, watercolours, drawings, reproductive engravings and sculpture.

[9][10] Known for his ability to reel off spontaneous art-related witticisms, one of his best known and oft-quoted quips pertains to vetting an artwork's authenticity by bearing in mind that "Everything but the naked picture is capable of lying.