Harald III (or Harold III) may refer to:
- Harald III of Norway (1015–1066), well known as Harald Hadrada ("hard ruler")
- Harald III of Denmark (1041–1080), well known as Harald Hen ("whetstone")
- Harald III, Earl of Orkney or Harald Eiriksson (fl. 1190s)
This disambiguation page lists articles about people with the same name.
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