William Robert Bousfield FRS KC (12 January 1854 – 16 July 1943) was a British lawyer, Conservative politician and scientist.

[7] Politically, Bousfield was a Conservative, and stood unsuccessfully twice for election as Member of Parliament for Mid Lanarkshire in the 1880s.

[1] He co-authored an article with his daughter C. Elspeth Bousfield on the specific heat of water in the Transactions of the Royal Society, published in 1919.

[1][7] His book The Mind and its Mechanism co-authored with his son Paul Bousfield postulated the existence of a "psychoplasm" which like protoplasm is an essential part of each cell.

[1][7] His son Paul Bousfield, was a specialist in nervous diseases who graduated MRCS, LRCP from St Bartholomew's Hospital.

[7][18] His other son John Keith Bousfield (1893–1945), was an army officer, businessman and member of the Legislative Council of Hong Kong.