Lady Mary Tudor
| Mary Tudor | |
|---|---|
| Countess of Derwentwater | |
| Painting by Bernard Lens of Lady Mary Radclyffe, Countess of Derwentwater (also known as Mary Tudor) | |
| Born | 16 October 1673 | 
| Died | 5 November 1726 (aged 53) Paris, France | 
| Spouse(s) | Major James Rooke (m. 1707) | 
| Issue | James Radclyffe, 3rd Earl of Derwentwater Lady Mary Tudor Radclyffe Charles Radclyffe, 5th Earl of Derwentwater Hon. Francis Radclyffe Margaret Frances Disney Rooke | 
| Father | Charles II of England | 
| Mother | Moll Davis | 
| Occupation | Actress | 
Lady Mary Tudor (16 October 1673 – 5 November 1726), by marriage Countess of Derwentwater, was an actress and biological daughter of King Charles II of England by his mistress, Mary "Moll" Davies, an actress and singer.