TNMOC, short for The National Museum of Computing, is an independent charity located on the historic Bletchley Park estate. As the proud custodian of the world's largest collection of functional historic computers and WW2 machines, they preserve, restore, and reconstruct historic computing machinery for preservation, display, and research. With a strong emphasis on British computing heritage and ongoing British innovation, TNMOC offers a unique and engaging approach to education and inspiration.

Visitors can explore the fascinating development of computing, from the ultra-secret pioneering efforts of the 1940s to the rise of personal computing in the 1980s and beyond. Highlights of the collection include Enigma, Lorenz, the working Turing-Welchman Bombe, the rebuilt Colossus (the world's first electronic computer), and the WITCH (the world's oldest working digital computer). In addition to its displays and demonstrations of working historic systems, TNMOC offers an active education program, festivals, lectures, and visitor activities.

They strive to raise awareness and inspire future generations of computer scientists, engineers, and inventors. TNMOC is an independent registered charity, responsible for its own fundraising and management. The museum collaborates with the Bletchley Park Trust, which manages the estate