Mark Steele (born 1960)[1] is a British conspiracy theorist who is best known for his videos alleging that 5G, WiFi and other communication networks are part of a distributed weapon system.

Steele describes himself as a "weapons expert", claiming to have worked on undisclosed projects for the Ministry of Defence,[3] and studied psychology and social sciences at the Open University.

Steele became convinced that these lamp-posts housed components of a 5G network, despite the council's claims to the contrary, and that this was the cause of his neighbour's illness.

[11][1] Steele's activism has focused on Gateshead council,[12] who he has claimed are "secretly trialling the technology, causing cancer and microwaving babies in their beds".

[4] Gateshead council issued a statement that, contrary to Steele's claims, their street-lighting was not part of a "secret government trial", does not use any 5G mobile technology, and would not cause nosebleeds, miscarriages or cancer.

[10] In October 2018, Steele won a court case overturning a July 2018 "gagging order", which had previously prevented him from blogging his claims on his personal website,[16][17] but was placed under an injunction to stop him harassing council staff and councillors.