The Rolls-Royce 100 EX and the 101 EX, with 'EX' standing for experimental models, are two related concept cars developed by Rolls-Royce Motor Cars and first shown at the Geneva International Auto Show in 2004 and 2006 respectively.
The 100 EX concept was produced, and presented in 2004, to celebrate the 100th anniversary of the meeting of businessman Charles Rolls and engineer Sir Henry Royce in 1904.