John Maynard (January 8, 1786 in Frederick County, Maryland – March 24, 1850 in Auburn) was an American lawyer and politician from New York.
Maynard graduated from Union College, Schenectady, New York, in 1810.
Then he studied law, and was admitted to the bar and commenced practice at Seneca Falls, New York.
He was a member of the New York State Assembly (Seneca Co.) in 1822.
He moved to Auburn, and was a justice of the New York Supreme Court (7th D.) from 1847 until his death.