John Sainsbury may refer to:
- John James Sainsbury (1844–1928), co-founder of the major UK supermarket chain Sainsbury's
- John Benjamin Sainsbury (1871–1956), eldest son of John James Sainsbury and Sainsbury's chairman 1928-1956
- John Sainsbury, Baron Sainsbury of Preston Candover (born 1927), great-grandson of John James Sainsbury and Sainsbury's chairman 1969-1992