| Honorific-Prefix: | Sir |
| John Shaw Rennie | |
| Order: | 1st |
| Office: | Governor-General of Mauritius |
| Primeminister: | Seewoosagur Ramgoolam |
| Term Start: | 12 March 1968 |
| Term End: | 3 September 1968 |
| Predecessor: | Position established |
| Successor: | Michel Rivalland (acting) |
| Office1: | Governor of Mauritius |
| Monarch1: | Elizabeth II |
| Term Start1: | 17 September 1962 |
| Term End1: | 12 March 1968 |
| Predecessor1: | Sir Colville Deverell |
| Successor1: | Himself (as governor-general) |
| Order2: | 7th |
| Office2: | Resident Commissioner of the New Hebrides |
| Monarch2: | Elizabeth II |
| Term Start2: | 1955 |
| Term End2: | 1962 |
| Predecessor2: | Hubert Flaxman |
| Successor2: | Alexander Mair Wilkie |
| Birth Date: | 12 January 1917 |
| Birth Place: | Glasgow, Scotland |
| Death Date: | [1] |
| Nationality: | Scottish |
Sir John Shaw Rennie (12 January 1917 – 12 August 2002) was a British civil servant and the United Nations Relief and Works Agency for Palestine Refugees in the Near East's Commissioner-General from 1971 to 1977.[2]
John Rennie was born in Glasgow and educated at Hillhead High School, Glasgow University and Balliol College, Oxford. In 1951 Rennie was appointed Britain's deputy colonial secretary for Mauritius.[3] He was the British Resident in the New Hebrides (now Vanuatu) from 1955 to 1962.[4]
From 1962 to 1968, he was Governor of Mauritius, overseeing Mauritius' transition to independence, including initiating discussions with Dr. Seewoosagur Ramgoolam, the Mauritian premier, over the detachment of the Chagos Islands from Mauritian territory.[5]
From 1968 to 1971, Rennie was UNRWA deputy Commissioner-General under Laurence Michelmore, who persuaded then-U.N. Secretary-General U Thant to appoint Rennie as his successor.[6]