Per Magnus Ranstorp (born 13 March 1965 in Hästveda) is a Swedish scholar who has written about Hezbollah, Hamas, Al-Qaeda and other militant Islamic movements.

In 2005 he was a contributor to the George C. Marshall Center directed project on "Ideological War on Terror: Synthesizing Strategies Worldwide" (funded by the Office of the US Secretary of Defense).

[2] In his manifesto mass-murderer Anders Behring Breivik copied 25 pages verbatim from an ideological text written by Evan Kohlmann and published by an institute led by Magnus Ranstorp.

[4][5] In June 2017 Ranstorp was appointed the leader of a study on jihadi salafist organisations in Sweden by the Swedish Civil Contingencies Agency.

[6] He was the subject of an incident in May 2023 when he threatened Professor Farid Hafez on Twitter for writing an essay accusing him of having ties to the UAE government.