Duke Philip Sigismund of Brunswick-Wolfenbüttel (July 1, 1568 in Hessen am Fallstein – 19 March 1623 in Iburg) was a Lutheran administrator of the Prince-Bishopric of Verden and Osnabrück (1591–1623) son of Julius, Duke of Brunswick and Lunenburg, Prince of Wolfenbüttel and Hedwig of Brandenburg.
Philip Sigismund of Brunswick-Wolfenbüttel Cadet branch of the House of Este Born: 1 July 1568 Died: 19 March 1623
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| Preceded byas Lutheran Prince-Bishop | Administrator of the Prince-Bishopric of Verden 1586–1623 |
Succeeded byas Lutheran administrator |
| Preceded byas Catholic Prince-Bishop | Administrator of the Prince-Bishopric of Osnabrück 1591–1623 |
Succeeded byas Catholic Prince-Bishop |