Sir John Isaac Thornycroft | |
|---|---|
 Photographic portrait from Cassier's Magazine, 1896 | |
| Born | 1 February 1843 Via Sistina, Rome, Papal States |
| Died | 28 June 1928 (aged 85) Bembridge, Isle of Wight, England |
| Nationality | English |
| Occupation | Engineer |
| Spouse | Blanche Coules |
| Parent(s) | Mary Francis and Thomas Thornycroft |
| Engineering career | |
| Discipline | Civil, Mechanical, Naval architect |
| Institutions | Institution of Naval Architects (Honorary Vice-President), Royal Society (Fellow, 1893), Institution of Civil Engineers (Council Member 1899–1907), Institution of Mechanical Engineers (Honorary Life Member), University of Glasgow (LL.D., 1901). |
| Projects | High speed vessels, steam- and combustion-engine vehicles. |
| Significant design | Hull designs, boiler designs |
Sir John Isaac Thornycroft FRS (1 February 1843 – 28 June 1928) was an English shipbuilder, the founder of the Thornycroft shipbuilding company and member of the Thornycroft family.