| Birth Date: | December 18, 1855 |
| Occupation: | Journalist, historian, educator |
| Family: | Horace Lyman (father) |
Horace Sumner Lyman (December 18, 1855 – December 22, 1904) was a prominent journalist, historian, and educator in the U.S. state of Oregon.[1] His father, Horace Lyman, was an Oregon pioneer in 1848.
Lyman served as editor of the Portland Pacific Express starting in 1885[2] and the Prohibition Star beginning in 1887. He contributed a number of firsthand accounts of Oregon pioneers to the Oregon Historical Quarterly, and published a history of the state in four volumes.