Sir John Jephson (died 6 May 1638) was an English soldier and politician who sat in the House of Commons between 1621 and 1625.
Jephson was the son of William Jephson of Froyle, Hampshire and his wife Mary Dannett, daughter of John Dannett of Dannett's Hall, Leicestershire. In 1603, he was knighted by Sir George Cary. He served in the army and became a major-general. In 1621, Jephson was elected Member of Parliament for Hampshire. In 1624, he was elected Member of Parliament for Petersfield and was re-elected MP for Petersfield in 1625.
Jephson married Elizabeth Norreys daughter of Sir Thomas Norreys Lord President of Munster. She brought the Irish estates at Mallow and elsewhere to the Jephson family. She died in 1623 and he married secondly Mary Ruish, widow of Sir Francis Ruish and formerly Richard Gifford, and daughter of Sir Henry Duke. Jephson was the father of William Jephson.
|Parliament of England|
Sir William Uvedale
| Member of Parliament for Hampshire
With: Sir Henry Wallop
Sir Daniel Norton
Sir Robert Oxenbridge
| Member of Parliament for Petersfield
With: Sir John Hippisley 1624