John Leal Haynes (July 3, 1821 – April 2, 1888) was an American soldier and politician.

Haynes was a Southern Unionist and served in the Union Army under Edmund J. Davis during the American Civil War.

[1] He volunteered for service during the Mexican-American War rising to the rank of lieutenant.

[1] Following the Civil War, he lived in Austin from 1865 to 1868 where he worked as an internal revenue collector.

[1] Haynes was married to Angelica Irene Wells and had five children.