Simon Williams is an English actor known for playing James Bellamy in the period drama Upstairs, Downstairs. Frequently playing upper middle class or aristocratic upper class roles, he is also known for playing Dr. Charles Cartwright in the sitcom Don't Wait Up and Sir Charles Merrick in medical drama Holby City.
Williams made a guest appearance in the fourth season of the Murdoch Mysteries in 2011, Downstairs, Upstairs, in honour of the actor's famous role.
In 2015 Williams appeared as Jeremiah Moxley in the BBC TV series Father Brown episode 3.7 The Kembleford Boggart.Williams has loyally served the Actors' Charitable Trust and Denville Hall for more than 30 years, including 15 years as joint Chairman with Angela Thorne. He also donates his time and expertise to the Sir Terence Rattigan Charitable Trust, the King George V Fund for Actors and Actresses, and several other charities.