Hannah Keziah Clapp (1824 - October 8, 1908) was a teacher, activist and feminist in Nevada, US.

She served as principal of the Lansing Female Seminary; taught at Michigan Female College; and was the first instructor and librarian at the University of Nevada, Reno.

Clapp co-founded Reno's 20th Century Club, which in 1983 was added to the National Register of Historic Places listings in Washoe County, Nevada.

She was born in Albany, New York in 1824, and arrived in Carson City in 1860, where she established the Sierra Seminary.

[1] Clapp was a charter member of the Nevada Historical Society.