Diana Osbourne
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| Portrayed by Holliday Grainger | |
| Full Name | Diana Hester Osbourne |
|---|---|
| Associated Noble House(s) | N/A |
| Date of Birth | 21st December 1789 |
| Father | Harold Osbourne |
| Father's Rank | Gentleman |
| Mother | Helen Osbourne (née Treville) |
| Mother's Rank | Gentleman's daughter |
| Town Residence | {{{residence}}} |
| Year of Debut | 1811 (delayed) |
| Dowry | £20,000 |
Miss Diana Osbourne is the only daughter of the late Harold and Helen Osbourne and the twin sister of James Osbourne. She has been brought up in seclusion at Thorncliffe Manor in Wales to believe herself the most important person in the universe, never travelling further than the local town until the previous year when her father died. At twenty-one, she is in control of her fortune and has come to London with her brother in order to spend it, but finds herself daunted by society.
Diana is played by Rose.