Sir John Alexander Armitt (born 2 February 1946) is an English civil engineer, and current chairman of the UK's National Infrastructure Commission.

[8] Armitt's salary and bonus of £878,000 – rising to more than £1m[9] when pension contributions are included, overtaking Adam Crozier, chief executive of Royal Mail.

[12] In October 2024, his term was extended by a further six months to oversee development of a 10-year strategy and the creation of the NIC's successor, the National Infrastructure and Service Transformation Authority (NISTA).

[13] Also in January 2023, he was appointed as a non-executive director on the board of Tilbury Douglas's parent company, TD Bidco, owned and controlled by shareholders of Interserve.

[17] His knighthood was criticised by the family of a victim of the Grayrigg derailment, as Armitt had been serving as chief executive of Network Rail at the time of the 2007 accident.