Roger David Blandford, FRS, FRAS (born 1949) is a British theoretical astrophysicist, best known for his work on black holes.

[1][2] Blandford is famous in the astrophysical community for the Blandford–Znajek process, which is a mechanism for powering relativistic jets by the extraction of rotational energy from a black hole.

[3] The Blandford–Znajek mechanism has been invoked by the Event Horizon Telescope Collaboration to explain the jet power in the first observation of a black hole shadow in the giant elliptical galaxy M87.

[4] Blandford also theorized another mechanism for jet formation through hydromagnetic winds launched from accretion disks.

[6] In April 2005 he wrote a letter to the astronomy community showing his concern about the George W. Bush administration US space science policy.