Thomas Glynn (died 1648) was a Welsh politician who sat in the House of Commons variously between 1624 and 1640.
He supported the Parliamentary side in the English Civil War.
Glynn was the son of Sir William Glynn of Glynllifon and his wife Jane Griffith, daughter of John Griffith (of Plas Mawr), Caernarvonshire.
In April 1640, he was again elected MP for Caernarvonshire in the Short Parliament.
[2] In the Civil War he supported the parliamentary side and was made governor of Caernarvon Castle after its surrender in 1646.