Josiah Tattnall, Sr. (1762June 6, 1803) was an American planter, soldier and politician from Savannah, Georgia. He represented Georgia in the U.S. Senate from 1796 to 1799 and was the 25th Governor of Georgia in 1801 and 1802. Born near Savannah, Georgia, he studied at Eton School before joining Anthony Wayne's troops at Ebenezer during the American Revolutionary War. After the war, he was elected brigadier general of the 1st Regiment in the Georgia Militia before being elected governor in 1801. He died in Nassau, New Providence.