Harold Whetstone Johnston (1859–1912), American historian known for his writings on ancient Rome
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Harold I. Johnston (1892–1949), American soldier and Medal of Honor recipient
Harold Pinter | Harold Wilson | Harold Macmillan | Harold Bloom | Harold Godwinson | Harold Lloyd | Joseph E. Johnston | Harold Stassen | Harold Prince | Daniel Johnston | J. Harold Ellens | Harold Holt | Ben Johnston | Sir Harold Hillier Gardens | Harold Washington | Harold Hitz Burton | Harold Alexander, 1st Earl Alexander of Tunis | Harold Peto | Harold & Kumar Go to White Castle | Harold Arlen | Harold | Albert Sidney Johnston | Harold Budd | Harold Eugene Edgerton | Harold Bauer | Ollie Johnston | Johnston Forbes-Robertson | Johnston Atoll | Harold von Schmidt | Harold Robbins |
Harold Johnston Brodie (December 3, 1907 – March 23, 1989) was a Canadian mycologist, known for his contributions to the knowledge of the Nidulariaceae, or bird's nest fungi.