Sten Bertil Ingemund Bengtsson (30 January 1919 – 12 April 2000) was a Swedish Social democratic politician, and Speaker of the Riksdag from 1979 to 1988.

He moved to Varberg and started working at the Monark bicycle factory at age 15.

He went on to become a prominent figure in local politics before he was elected as a Member of Parliament in 1951.

When the King of Sweden is prevented from performing his duties as Head of State, for reasons of illness, travel or other, and when no other member of the Royal House, who is in the line of succession, is present within the realm, the Government issues a decree that establishes a Regent ad interim who will uphold the duties as Head of State for the duration of His Majesty's incapacity.

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