James Blackwell may refer to:
James Blackwell (basketball) (born 1968), American basketball player James Blackwell (educator) (1864–1931), American educator James Blackwell (rugby union) (born 1995), New Zealand rugby union player James Bartholomew Blackwell (1763–1820), Irish mercenary and French Army officer James DeRuyter Blackwell (1828–1901), author and poet of the American Civil War era