Charles Donald Jacob (1838-1898) served four terms as mayor of Louisville, Kentucky, two consecutively in 1873-78, then later in 1882-84 and 1888-90. He also served as the U.S. minister to Colombia in 1885-1886. He was a member of the Democratic Party.
In Mayor Jacob's third term, he oversaw the opening of the Southern Exposition. Perhaps Jacob's most lasting contribution to his city was his fourth term establishment in 1889 of a large park, today called Iroquois Park, that was landscaped by Frederick Law Olmsted.