| Reference number | Title | Date |
| DM/6/24 | Letter from Sir Henry Ellis to C R Weld, Assistant Secretary, Royal Society | 23 January 1856 |
| DM/6/18 | Letter from Sir Henry Ellis to C R Weld, Assistant Secretary, Royal Society | 31 May 1855 |
| DM/6/25 | Letter from Sir Henry Ellis to C R Weld, Assistant Secretary, Royal Society | 22 January 1856 |
| MS/425/1 | Copy letter, John William Lubbock, Treasurer of the Royal Society, to Henry Ellis, British Museum | 13 December 1830 |
| MC/2/224 | Letter from Henry Ellis, [Principal Librarian at the] British Museum, to John David Roberton, [Assistant Secretary of the Royal Society] | 14 October 1836 |
| DM/2/51 | Letter from Henry Ellis, British Museum, to P M Roget | 27 December 1829 |
| EC/1811/10 | Ellis, Sir Henry: certificate of election to the Royal Society | |
| MC/1/165 | Letter from Henry Ellis, [Assistant Keeper of Printed Books], British Museum, to Davies Gilbert, President of the Royal Society | 30 December 1828 |
| MC/1/172 | Letter from Edward Sabine, 1 Devonshire Place, to Dr. Peter Mark Roget, 39 Bernard Street | 13 July 1829 |
| MC/2 | Volume 2 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1832-1838 |
| MC/1 | Volume 1 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1800-1831 |
| MC/5/173 | Letter from Henry Ellis, Principal Librarian at the British Museum, to Colonel [Edward] Sabine, Treasurer of the Royal Society | 26 July 1854 |
| AP/23/9 | Unpublished paper, 'Experiments made on a piece of peña silver, as to its capability of holding water; saved from the Lady Charlotte, wrecked on the Coast of Ireland in December 1838' by William Debonnaire Haggard | January 1839 |
| AP/20/10 | Unpublished paper, 'Some account of the appearances of the solar spots, as seen from Hereford, on the 15th and 16th of May 1836 during and after the solar eclipse' by Henry Lawson | 6 June 1836 |
| MC/5 | Volume 5 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1851-1858 |