| Reference Number | Title | Date | Series |
| RNT/PP/2/2/77 | The Tragedy of The Duchess of Malfi | 4 July 1985 | Lyttelton Posters |
| RNT/PO/5/143 | The Tragedy of The Duchess of Malfi | 1985 | Set Photographs |
| RNT/PP/1/2/89 | The Tragedy of The Duchess of Malfi | 4 July 1985 | Lyttelton Programmes |
| RNT/PR/3/248 | The Tragedy of The Duchess of Malfi | 1985 | Rehearsal and Production Photographs |
| RNT/PR/4/1/327 | The Tragedy of The Duchess of Malfi | April 1985 - October 1985 | Press Production Review Files |
| RNT/SM/1/251 | The Tragedy of The Duchess of Malfi | 1985 | Prompt Scripts |
| RNT/PP/5/156 | The Tragedy of The Duchess of Malfi | 1985 | Rehearsal Photographs |
| RNT/E/3/3/25 | The Tragedy of The Duchess of Malfi | 1985 | Background Packs |
| RNT/PO/2/1/45 | The Tragedy of The Duchess of Malfi | 1985 | Lyttelton Production Office Show Files |
| RNT/CO/1/176 | The Tragedy of The Duchess of Malfi | 1985 | Costume Department Production Files |
| RNT/PR/2/2/141 | The Tragedy of The Duchess of Malfi to be the first production by Ian McKellen and Edward Petherbridge's NT Group | 10 April 1985 | Press Releases 1980-1989 |
| RNT/SM/2/3/57 | The Tragedy of The Duchess of Malfi | 1985 - 1986 | Lyttelton Show Reports |
| RNT/PP/1/6/194 | The Duchess of Malfi | 28 April 1986 | Touring programmes |
| RNT/PR/4/3/53 | The Duchess of Malfi/The Cherry Orchard/ The Real Inspector Hound/ The Critic | 28 April - 25 May 1986 | Press West End Transfer and Touring Review Files |
| RNT/PP/3/9/3/44 | The Duchess of Malfi | 1985 | Lyttelton Cast Lists |