Sir Walter St John, 3rd Baronet (May 1622 – 3 July 1708), of Lydiard Tregoze, Wiltshire, and of Battersea, was an English Member of Parliament.
[2] On his death the baronetcy passed to a grandson Henry St John who was created a viscount in 1716.
[2] Sir Walter married, in or before 1651, Johanna a daughter of Oliver St John, of Longthorpe county Northampton, Lord Chief Justice of the Common Pleas (1648–1660) and his first wife Johanna daughter and heir of Sir James Altham.
His daughter, Anne St. John, married Thomas Cholmondeley, twice MP for Cheshire.
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