Horace Lyman (November 16, 1815 – March 31, 1887) was an American reverend and professor of mathematics in the U.S. state of Oregon.

[1] Lyman was born in Massachusetts, and moved to Oregon by way of New York and Cape Horn in October 1848.

[2] He was founding secretary of LaCreole Academic Institutue near Dallas, Oregon in 1856.

[4] Lyman served as Hillsboro's first commissioner, and later its school superintendent.

[5] He later taught mathematics at Pacific University in Forest Grove, where he died in 1887.