Harald or Harold is the name of several kings and lesser rulers:
Kings of Denmark
- Harald I of Denmark (c. 911 – November 1, 987), also known as Harald Bluetooth.
- Harald II of Denmark
- Harald III of Denmark
Kings of England
- Harold I of England, also known as Harold Harefoot.
- Harold II of England (c. 1022 – October 14, 1066), also known as Harold Godwinson.
Kings of Norway
- Harald I of Norway (c. 848 – c. 931), also known as Harald Fairhair.
- Harald II of Norway (died 969), also known as Harald Greycloak.
- Harald III of Norway (born 1015 – died Stamford bridge, England, September 25, 1066), also known as Harald Hardråde.
- Harald IV of Norway (died 1136), also known as Harald Gille.
- Harald V of Norway (born February 21, 1937), present King of Norway.
Grand Dukes of Kiev
- Mstislav the Great, known as Harald in Norse Sagas
King of Mann (Norwegian vassal)
- Harald I of Mann (died 1248), also known as Harald the Black.
Earls of Orkney (Norwegian vassals)
- Harald Haakonsson (died 1127)
- Harald Maddadsson (c. 1134 – 1206)
- Harald Eiriksson
- Other people
- Harald Bohr (1887–1951), Danish mathematician
- Harald Sandberg (born 1951), Swedish diplomat