Boyd Daniel Clack (born 7 March 1951) is a Canadian-born Welsh writer, actor, and musician. He was born in Vancouver, Canada to Welsh parents. At a young age, he emigrated with his family to Wales, where he grew up in Tonyrefail, where his family were originally from.

His acting credits include Twin Town, High Hopes, and Satellite City, the latter two of which he also co-wrote. He has also released the first part of his autobiography. Kisses Sweeter than Wine, and two music albums, Welsh Bitter and Labourer of Love.