Matthew Boulton (; 3 September 1728 – 17 August 1809) was an English manufacturer and business partner of Scottish engineer
James Watt. In the final quarter of the 18th century, the partnership installed hundreds of
Boulton & Watt steam engines, which were a great advance on the state of the art, making possible the mechanisation of factories and mills. Boulton applied modern techniques to the minting of coins, striking millions of pieces for Britain and other countries, and supplying the
Royal Mint with up-to-date equipment.