James Meech Warner (January 29, 1836 – March 16, 1897) was a New England manufacturer and a brevet brigadier general in the Union Army during the American Civil War.

His regiment was assigned to the northern defenses of Washington, D.C., from September 1862 until May 1864, when Lt. Gen. Ulysses S. Grant called for more troops to support his Overland Campaign.

He returned from convalescence leave on July 8, 1864, and was assigned to command the 1st brigade, Hardin's division, XXII Corps, in the defense of Washington.

On January 31, 1865, President Abraham Lincoln nominated Warner for appointment to the grade of brevet brigadier general, Volunteers, to rank from April 1, 1864, "for gallant and meritorious service" at the battle of Spotsylvania Court House, and at the battles of Winchester, Fisher's Hill and Cedar Creek.

Warner died March 16, 1897, in New York City, and his remains were returned to Middlebury, Vermont, for interment.