Upjohn was a pharmaceutical firm.
Upjohn, as a surname, is a patronymic name derived from the Welsh "ap Siôn" meaning "son of John". It may refer to:
People Gerald Upjohn, Baron Upjohn (1903–1971), a soldier and judge Hobart Upjohn (1876–1949), an architect Ian Upjohn, barrister Richard M. Upjohn (1828–1903), architect Richard Upjohn Light (1902–1994), a neurosurgeon, aviator, cinematographer and geographer Richard Upjohn (1802–1878), an English-born architect William E. Upjohn (1853–1932), a medical doctor William George Dismore Upjohn (1888–1979), a surgeon
Fictional characters Aubrey Upjohn, fictional character in the Jeeves novels by P. G. Wodehouse Mrs. Emily Upjohn, a character in the Marx Brothers' film A Day at the Races
Other uses Upjohn Co. v. United States, 449 U.S. 383 (1981), a Supreme Court case Upjohn dihydroxylation, an organic reaction which converts an alkene to a cis vicinal diol Upjohn's Triangle of Health, a short-lived series of animated short films produced in late 1960s and again in late 1970s by The Walt Disney Company's educational media division W. E. Upjohn Institute for Employment Research, an American independent research organization based in Kalamazoo, Michigan