Horace Mann (1796–1859) was an American education reformer.
Horace Mann may also refer to:
- Horace Mann Bond (1904–1972), American historian and father of civil-rights leader Julian Bond
- Horace Mann Jr. (1844–1868), American botanist
- Horace Mann Towner (1855–1937), American politician
- Sir Horace Mann, 1st Baronet (1706–1786), diplomat, long standing British resident in Florence, known for his correspondence with Horace Walpole
- Sir Horatio Mann, 2nd Baronet (1744–1814), member of Parliament and cricket patron, nephew of Sir Horace Mann, 1st Baronet