Lewis Tappan Barney (March 18, 1844 – December 19, 1904) was an officer in the Union Army during the American Civil War.

[1][2] In 1862, after the American Civil War raged for a year, Barney joined the 7th New York Militia Regiment (Company F) as a Private for 90-day service.

At the time present the 68th Infantry was part of the Army of the Potomac's XI Corps and, in the brigade of Alexander Schimmelfennig, was posted in the Washington defenses.

[2][4] In February 1864 Barney was promoted to captain and assigned to the staff of General Rufus Saxton.

[2] After the war Barney settled in California and married his wife, Mary S. Fowler, in 1875.