George Lewis Newnham (c. 1733–1800) was an English lawyer and politician who sat in the House of Commons from 1774 to 1780.
[2] Newnham's father recommended his son to the Duke of Newcastle for a seat in Parliament in 1761, but the Duke appeared to exclude him from opportunities at Lewes.
In 1768 Newnham stood at Nottingham but withdrew before the poll.
At the 1774 general election, he was returned unopposed as Member of Parliament for Arundel on the interest of Sir John Shelley.
[1] Newnham married Mary Ashton of Lincoln's Inn Fields on 7 October 1778.