George Gardner Barnard (c. 1829 Poughkeepsie, Dutchess County, New York – April 27, 1879 New York City) was an American lawyer and politician from New York. He was one of only four people ever tried by the New York Court for the Trial of Impeachments.
He was the son of Frederic Barnard and Margaret (Allen) Barnard. He graduated from Yale College in 1847. Then he studied law with his brother Joseph F. Barnard, who was later Presiding Justice of the 2nd District of the New York Supreme Court. George was admitted to the bar, and began practice in Poughkeepsie, but soon went to California and practiced law there. In 1856, he returned to the East, and practiced law in New York City in partnership with Joseph J. Chambers.
In November 1857, Barnard was elected on the Tammany Hall ticket Recorder of New York City, and remained in office from 1858 until the end of 1860. He presided at the trial of "Dad" Cunningham for the murder of "Paudeen" McLaughlin. On June 29, 1859, Barnard married Frances Anderson, and they had six children.
In November 1860, Barnard was elected to an 8-year term on the Supreme Court (1st District), and re-elected in 1868. Barnard became involved in a series of railroad litigations, beginning with the Erie War, when in February 1868 — on the petition of Att. Gen. Marshall B. Champlain — he removed Daniel Drew as Director and Treasurer of the railroad, and appointed Cornelius Vanderbilt's son-in-law George A. Osgood as Receiver for $10,000,000 of new Erie Railroad stock. In November 1868, Barnard appointed Jay Gould as Receiver of the Erie Railroad, but a week later Judge Josiah Sutherland vacated Barnard's order, and appointed Judge Henry E. Davis as Receiver instead. In August 1869, during the struggle for the Albany and Susquehanna Railroad, Judge Rufus W. Peckham appointed Robert H. Pruyn as Receiver, but Barnard vacated Peckham's order, and appointed James Fisk instead. Eight suits and cross-suits followed, and an armed attempt — involving more than 1,000 men on both sides — to seize the road was made by Fisk and Gould, but Pruyn was confirmed as Receiver. Barnard continued to favor Fisk and Gould in the railroad litigations, culminating in his seizing 16 suits from the New York City Superior Court and the New York City Court of Common Pleas, to be tried by himself in the Supreme Court. This was reversed later by the General Term (now called the Appellate Division), affirming that a case must be tried in the court where it was brought.