Sir Lewis Dyve (1599–1669) was an English Member of Parliament and a Royalist adherent during the English Civil War. His surname is sometimes also spelt Dive or Dives.
Dyve was born on 3 November 1599. He was the son of Sir John Dyve and Beatrix Walcot, who married secondly John Digby, 1st Earl of Bristol.
Dyve, who had an estate at Bromham in Bedfordshire, was knighted in 1620 and was one of the attendants of Prince Charles during his time at Madrid. He was elected MP for Bridport in the Parliaments of 1625 and 1626, and for Weymouth in that of 1628. Some sources record him as having been once more chosen to represent Bridport in December 1640, but in fact he seems to have been the defeated candidate petitioning the House of Commons against the result of the election; as his was the first disputed election to be heard in the Long Parliament, the committee which subsequently heard other election petitions was referred to as The Committee on Sir Lewis Dive for several years.
Dyve was concerned in the printing and publishing of his half-brother Lord Digby's speech on the attainder of the Earl of Strafford, for which the House of Commons resolved on 13 July 1641 that the books should be burned and ordered that Dyve should be arrested. On the outbreak of the Civil War he was concerned in a plan to admit the Royal forces to Hull, for which the Parliamentary governor, Sir John Hotham, ordered his arrest. Escaping the troops sent to seize him, he fled to Holland, but returned to England later the same year and was wounded at a skirmish at Worcester. In 1643, the House of Commons voted for his impeachment for High Treason for raising money for the King and for referring to Parliament as "The Pretended Parliament"; Roger Hill, the Bridport MP whom he had tried to unseat in 1640, brought in the motion.