Blanche Thornycroft | |
|---|---|
 | |
| Born | 21 December 1873 Hammersmith, Middlesex, England |
| Died | 30 December 1950 |
| Nationality | British |
| Occupation | Marine engineer |
| Employer | John I. Thornycroft & Company |
| Parent(s) | Sir John Isaac Thornycroft Blanche Coules |
Blanche Coules Thornycroft (21 December 1873 – 30 December 1950) was a British naval architect. She was not formally recognised in her lifetime but her role as an "assistant" is now better credited.