Clifford Odets (1906 - 1963), American playwright, screenwriter, socialist, and social protester

T.I., Clifford Joseph Harris Jr.

Clifford Algebra - A type of associative algebra

William Kingdon Clifford (1845-1879), Mathematician and philosopher , eponym of Clifford algebras

Cliff Burton (1962 - 1986), bass guitarist of American metal band Metallica

Max Clifford (b. 1943), an English publicist

Clark McAdams Clifford (1906-1998), Former U.S. Secretary of Defense

Nathan Clifford (1803–1881), American statesman, diplomat and jurist

Michael R. Clifford (b. 1952), U.S. astronaut

Rosamund Clifford (c. 1150-1176), "Fair Rosamund", mistress of Henry II of England

Clifford the Big Red Dog, a children's book character and a TV-series based on it

Charles Clifford, 1st Baronet Clifford, of Flaxbourne (1813-1893), New Zealand politician

Clifford Stoll, an astronomer, computer systems administrator, and author.

Clifford, North Dakota

Clifford, Indiana

Clifford (film), a 1994 film

Henry Hugh Clifford (1826–1883), British army officer

Clifford, Michigan

Augustus William James Clifford (1788–1877), British naval officer and court official

Clifford (Muppet), a Muppet character performed by Kevin Clash

Clifford, West Yorkshire

Edward Clifford (1844-1907), an English artist and author

Clifford, Pennsylvania

Lady Anne Clifford (1590-1676), Countess of Pembroke. Undertook significant building and restoration work in Westmorland and surrounding counties.

Baron Clifford, Baron Clifford of Chudleigh, Baron de Clifford, Clifford Baronets