The actor, dancer and singer beat Fatiha El-Ghorri, Richard Herring and Denise Van Outen in the final, after the four made it through to battle for the title.
Comedian and Celebrity Traitors alum Lucy Beaumont and ex-footballer Paul Merson made up the rest of the line-up, but were knocked out before the grand finale.
The result confirmed Williams as champion of the celebrity spin-off of the long-running ceramics contest, filmed at the Gladstone Pottery Museum in Stoke-on-Trent.
Reacting to his win, Williams said: "I am genuinely so thrilled. I was ready to do my 'supportive friend face' but I'm so overjoyed and really just humbled. I'm really, really happy. I never bloody win anything!"
Williams, 31, made his professional debut aged 12 in the title role of the West End musical Billy Elliot, and went on to lead Everybody's Talking About Jamie in London and LA.
Other theatre roles include the Emcee in Cabaret and The Iceberg in Titanique, for which he won an Olivier Award for Best Supporting Actor in a Musical.
Fellow finalist Richard Herring was gracious in defeat, saying: "I think it's very fair. I think it was pretty close but his work with the clay is just so beautiful and he took some really good risks, so I'm very happy for him."
Judge Keith Brymer Jones, known for being moved to tears by contestants' work, praised the group's efforts.
Co-judge Rich Miller added: "Clay is one of those materials that's so human. They came in as six celebrities and I hope that they've left as six potters."
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