Greenleaf is a surname, and occasionally also a given name.

Surname

• Cat Greenleaf (born 1972), American TV reporter
• Diunna Greenleaf (born 1957), American blues singer and songwriter
• Elizabeth Bristol Greenleaf (1895–1980), American collector of folk songs
• Elizabeth Gooking Greenleaf (1681–1762), American apothecary
• Frank Greenleaf (1877–1953), Canadian sports administrator
• Halbert S. Greenleaf (1827–1906), American politician; spouse of Jean
• James Greenleaf (1765–1843), American land speculator
• Jean Brooks Greenleaf (1832–1918), American woman suffragist; spouse of Halbert
• Ralph Greenleaf (1899–1950), American pocket billiard champion
• Raymond Greenleaf (1892–1963), American actor
• Robert K. Greenleaf (1904–1990), founder of the modern Servant leadership movement
• Simon Greenleaf (1783–1853), American jurist
• Stephen Greenleaf (1628–1690), American politician and soldier
• Stewart Greenleaf (1939–2021), American politician
• William Greenleaf (born 1948), American science fiction author

First name

• Greenleaf Clark (1835–1904), American jurist and lawyer
• Greenleaf Whittier Pickard (1877–1956), American radio pioneer
• Greenleaf S. Van Gorder (1855–1933), American politician from New York

Middle name

• Ezra Greenleaf Weld (1801–1874), American photographer, often known simply as "Greenleaf"
• John Greenleaf Whittier (1807–1892), American Quaker poet
• John Greenleaf Adams (1810–1897), American hymnwriter
• Stephen Greenleaf Bulfinch (1809–1870), American clergyman and hymn writer
• William Greenleaf Eliot (1811–1887), American educator