Harry James Powell CBE (24 January 1853 – 26 November 1922) was a British glassmaker associated with the Arts and Crafts Movement.

Powell graduated from Trinity College, Oxford in 1873, where he studied mechanics, physics and chemistry.

Powell discovered that by exposing glass to higher temperatures, he could change the colour in dramatic ways.

The new colours were developed for the use in the mosaics designed by William Blake Richmond for St. Paul's Cathedral.

[2] Powell wrote down his experiments and made detailed notes of his impressions and work in notebooks.