Simon Thelwall (1601–1659) was a Welsh politician who sat in the House of Commons at various times between 1640 and 1654. He fought in the Parliamentary army in the English Civil War.
- Occupation
- politician
- Position held
- Member of Parliament in the Parliament of England, Member of the First Protectorate Parliament, Member of the 1642-48 Parliament
- Born
- 1601
- Died
- 1659
