Sir John Stonhouse, 3rd Baronet

Sir John Stonhouse, 3rd Baronet (c.1672–1733) was an English politician.

He was the eldest son of Sir John Stonhouse, 2nd Baronet of Radley by his wife Martha Brigges, and was educated at The Queen's College, Oxford and the Inner Temple. Elected Member of Parliament for Berkshire in December 1701, he held the seat for the rest of his life, as a Tory.

Radley Hall, now part of Radley College, built in the 1720s for Sir John Stonhouse

From 1721, Stonhouse had Radley Hall built. The work was carried out by the Oxford masons Bartholomew Peisley III and William Townesend, to 1725.

Stonhouse married twice. By his first wife Mary Mellish he had two daughters, of whom Martha married Arthur Vansittart of Shottesbrook, and was mother of Robert Vansittart, Henry Vansittart and Arthur Vansittart, MP for Berkshire. His second wife was Penelope, daughter of Sir Robert Dashwood, 1st Baronet. They had nine children. Of those, three sons (John, William and James) in succession held the baronetcy. One of the daughters, Penelope, married John Leveson-Gower, 1st Earl Gower, as her second husband; another, Catherine, married Robert Lee, 4th Earl of Lichfield. Anne married Sir George Bowyer, 3rd Baronet and was mother of Sir George Bowyer, 5th Baronet.

Radley Hall descended to a granddaughter of the 3rd Baronet, Penelope, Lady Rivers. She was the daughter of Penelope, by her first husband, Sir Henry Atkins, 4th Baronet of Clapham; she married George Pitt, 1st Baron Rivers. Sir James Stonhouse died unmarried in 1792, leaving the Hall to Lady Rivers. Under the terms of the will, when she died in 1795, it passed to Sir George Bowyer, 5th Baronet.