Bernard Gaines Farrar Jr. (1831–1916) served in the American Civil War as an officer in the Union Army.

Farrar Jr. began his military career on the staff of General Nathanial Lyon and then rose through the ranks until he was brevetted Brigadier-General.

His father was the first doctor of American descent to set up permanent residence west of the Mississippi, and his mother was the niece of William Clark.

He was also an active participant in the Camp Jackson Affair, personally sent to Confederate General Frost delivering the message to surrender.

Serving under General Ulysses S. Grant in the Mississippi River campaigns; he commanded Francis P. Blair's Brigade in the Siege of Vicksburg.