Jonathan Blanchard (January 19, 1811 – May 14, 1892) was an American pastor, educator, social reformer, and abolitionist. Born in Vermont, Blanchard attended Middlebury College before accepting a teaching position in New York. In 1834, he left to study at Andover Theological Seminary, but departed in 1836 after the college rejected agents from the American Anti-Slavery Society. Blanchard joined the group as one of Theodore Dwight Weld's "seventy" and preached in favor of abolition in southern Pennsylvania.