Mills Watson est né le 10 juillet 1940 en Californie, États-Unis. Il est acteur. Il est connu pour Cujo (1983), Faut trouver le joint (1978) et Papillon (1973). Il est marié avec Sue. Il a été marié avec Caroline Mary Mason.
When asked in an interview if he missed acting, he replied: "No. I was very fortunate to have been able to do as much as I wanted. I did enough of that. Today I have a fifteen-acre farm, growing hay. I just relax here with Sue. There's no pressure up here in Oregon. It's safe and it's not stressful at all, which I feel is keeping me alive.