Greenwood, John, 1727-92, American artist, b. Boston, Mass. An engraver and painter, Greenwood executed some of the first genre paintings in America. He is also noted for his satirical works peopled with small, energetic figures reminiscent of Hogarth's.

John Greenwood may refer to:

• John Greenwood, Puritan divine
• John Greenwood (1760-1819), George Washington's dentist and the "Father of Modern Dentistry"
• John D. H. Greenwood, English composer of classical and film music
• John Greenwood (artist), colonial American artist
• Captain John Greenwood, British sea captain
• John Greenwood (1829-74, MP) (1829-74), British Member of Parliament
• John Greenwood, trustee of the Social Affairs Unit
• John Greenwood (bus operator), transport entrepreneur from Salford
• John Greenwood (executive), (1950 - 2008) catering executive