Robert David Farquhar (23 February 1872 – 6 December 1967) was an architect working in California from 1905 to 1940.

Farquhar completed an architectural degree at the Massachusetts Institute of Technology (1893–1895), and then attended École des Beaux-Arts in Paris (1896–1901), where he organized the first ever American football game played in Europe.

He was appointed a member of the architectural commission of the Panama-Pacific Exposition, held in San Francisco in 1915, and designed Festival Hall.

[5][6] The Southern California Chapter of the American Institute of Architects awarded Farquhar its Distinguished Honor Award for the William Andrews Clark Mausoleum, and Certificates of Honor for the design of the William Andrews Clark Memorial Library and the California Club.

[7] The archives of his architectural studies and drawings are maintained at the UCLA Department of Special Collections.