| RefNo | Title | Date |
| IM/003367 | Olbers, Heinrich Wilhelm Mathias | nd |
| EC/1803/12 | Olbers, Heinrich Wilhelm Mathias: certificate of election to the Royal Society | |
| PT/1/15 | Letter, 'Extract of a letter from Dr [Heinrich] Olbers FRS to Dr [Thomas] Young, For Sec RS, announcing the discovery of a new planet' | 2 April 1807 |
| AP/7/12/2 | Unpublished translation of a letter, on a discovery of a new star from Schroeter [Johann Hieronymus Schroter] to [George] Best | 31 March 1802 |
| AP/7/12/1 | Unpublished letter, on a discovery of a new star from Schroeter [Johann Hieronymus Schroter] to [George] Best | 31 March 1802 |
| AP/7/12/3 | Unpublished letter, on Pallas observations from [Heinrich Wilhelm Matthias] Olbers to Schroeter [Johann Hieronymus Schroter] | 7 May 1802 |
| AP/7/12 | Unpublished letters, on astronomical discoveries from Schroeter [Johann Hieronymus Schroter] and [Heinrich Wilhelm Matthias] Olbers | March-May 1802 |
| PT/1/14 | Letter, regarding observations of planet Vesta from Stephen Groombridge to Stephen Lee | 29 April 1807 |
| HS/13/176 | Letter, from Heinrich Wilhelm Matthias Olbers to Sir John Herschel, dated at [Bremen] | 28 December 1827 |
| HS/13/175 | Letter, from Heinrich Wilhelm Matthias Olbers to Sir John Herschel, dated at Bremen | 28 December 1827 |
| HS/13/180 | Letter, from Heinrich Wilhelm Matthias Olbers to Sir John Herschel, dated at Bremen | 23 July 1838 |
| HS/13/177 | Letter, from Heinrich Wilhelm Matthias Olbers to Sir John Herschel, dated at Bremen | 7 July 1829 |
| HS/13/178 | Letter, from Heinrich Wilhelm Matthias Olbers to Sir John Herschel, dated at Bremen | 29 November 1832 |
| HS/19/9 | Summary of letter from Sir John Frederick William Herschel and Heinrich Wilhelm Matthias Olbers | 1821 |
| HS/13/174 | Letter, from Heinrich Wilhelm Matthias Olbers to Sir John Herschel, dated at Bremen | 11 March 1821 |