Lady Mary Douglas-Hamilton
| Lady Mary Victoria Douglas-Hamilton | |
|---|---|
| Hereditary Princess of Monaco | |
| Born | Lady Mary Victoria Douglas-Hamilton 11 December 1850 Hamilton Palace, Scotland, United Kingdom of Great Britain and Ireland | 
| Died | 14 May 1922 (aged 71) Budapest, Hungary | 
| Burial | Festetics Mausoleum | 
| Spouse | |
| Issue | Louis II, Prince of Monaco Countess Mária Matild Festetics de Tolna Prince György Tasziló Festetics de Tolna Countess Alexandra Olga Festetics de Tolna Countess Karola Friderika Festetics de Tolna | 
| House | Hamilton | 
| Father | William Hamilton, 11th Duke of Hamilton | 
| Mother | Princess Marie Amelie of Baden | 
Lady Mary Victoria Douglas-Hamilton, also known as Mary Victoria Hamilton (11 December 1850 – 14 May 1922), was a Scottish noblewoman who was the Hereditary Princess of Monaco by marriage to Albert, Hereditary Prince of Monaco.