| RefNo | Title | Date |
| DM/6/82 | Letter from W D Cooper to Admiral Smyth | 21 April 1856 |
| MM/19/7 | Letter from Edward Sabine, Treasurer, Royal Society | 13 November 1854 |
| MM/19/102 | Letter from William Henry Smyth to Thomas Bell, Secretary, Royal Society | 7 December 1852 |
| MM/19/33 | Letter from Edward Sabine, Treasurer, Royal Society, to William Sharpey, Secretary, Royal Society | 14 April 1862 |
| DM/1/3 | Letter from W H Smyth, Crescent, Bedford | 5 March 1831 |
| MC/5/73 | Letter from Benjamin Peirce, Harvard University, to Captain W H [William Henry] Smyth, [Foreign Secretary of the Royal Society] | 20 December 1852 |
| AP/18/5c | Unpublished letter, regarding reports on the wreck of HMS Thetis from W H [William Henry] Smyth to J G [John George] Children | 19 April 1834 |
| MC/2/258 | Letter from William Henry Smyth, Bedford, to John George Children, Secretary of the Royal Society | 14 July 1837 |
| RR/1/52 | Referee's report by William Henry Smyth and Charles Giles Bridle Daubeny, on a paper 'Some account of a new volcano in the Mediterranean' by John Davy | [1832] |
| MS/426/557 | Copy letter from C R [Charles Richard] Weld, the Assistant Secretary of the Royal Society; to Sir R [Roderick Impey] Murchison | 9 February 1856 |
| MS/257/4/220 | Letter from William Henry Smyth, St John's Lodge near Aylesbury to [Edward Sabine] | 15 April 1852 |
| MS/426/465 | Note of letters from C R [Charles Richard] Weld, the Assistant Secretary of the Royal Society; to Lord Rosse [William Parsons], Prof [Thomas] Graham, Capt [William Henry] Smyth | 7 May 1852 |
| MM/19/104 | Printed letter to members of the Southern Telescope Committee, from Thomas Bell, Secretary, Southern Telescope Committee | 15 December 1852 |
| DM/4/107 | Letter from Captain Smyth, Bedford, to James Hudson, Assistant Secretary, Royal Society | 22 December 1830 |
| IM/004296 | Smyth, William Henry | nd |
| RR/2/206 | Referee's report by William Henry Smyth, on a paper 'On the eclipses of Agathocles, Thales and Xerxes' by George Biddell Airy | 26 February 1853 |
| MM/12/70 | Letter from Charles Piazzi Smyth, London, to W H Smyth | 22 December 1852 |
| EC/1826/12 | Smyth, William Henry: certificate of election to the Royal Society | |
| MC/5/131 | Letter from [Carl Friedrich Philipp von] Martius, Munich, to Captain W H [William Henry] Smyth, Foreign Secretary of the Royal Society | 3 December 1853 |
| RR/1/160 | Referee's report by William Henry Smyth, on a paper 'New ideas on electricity, applied to the invention of an earthquake guard' by Pasquale Stanislao Mancini | 4 May 1838 |
| MC/2 | Volume 2 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1832-1838 |
| MC/3 | Volume 3 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1839-1843 |
| MC/3/10 | Letter from William Henry Smyth, Athenaeum, to Messrs Hobson, 11 Nile Street, Liverpool | 15 February 1839 |
| MC/3/43 | Letter from William Henry Smyth, Cardiff Castle, to Samuel Hunter Christie, Secretary of the Royal Society | 2 October 1839 |
| MC/3/59 | Letter from [Adolphe] Quetelet, Secrétaire perpètuel de l'Académie Royale des Sciences et Belles-Lettres, to Captain [William Henry] Smyth, Foreign Secretary of the Royal Society | 2 December 1839 |
| MC/3/263 | Letter from William Henry Smyth, Cheyne Walk, Chelsea, to Samuel Hunter Christie, Secretary of the Royal Society | 7 February 1843 |
| RR/1/55 | Referee's report by William Henry Smyth, on an unnamed paper by Demouville | 25 September 1838 |
| MC/4/107 | Letter from John Ross, Captain with the Royal Navy, London, to Captain William Henry Smyth | 10 December 1845 |
| MS/426/313 | Copy letter from C R [Charles Richard] Weld, the Assistant Secretary of the Royal Society; to C P [Charles Piazzi] Smyth Esq | 18 February 1848 |
| MS/426/419 | Copy letter from S H [Samuel Hunter] Christie, Secretary of the Royal Society; to Capt W H [William Henry] Smyth | 20 April 1850 |
| MC/4/337 | Letter from [William Henry] Smyth, 3 Cheyne Walk, Chelsea, to [Charles Richard] Weld, [Assistant Secretary of the Royal Society] | 23 March 1850 |
| MC/4 | Volume 4 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1844-1850 |
| MC/5/31 | Letter from W H [William Henry] Smyth, [Foreign Secretary of the Royal Society], St John's Lodge, near Aylesbury, to Colonel [Edward] Sabine, [Treasurer of the Royal Society] | 13 February 1852 |
| MS/426/474 | Copy letter from C R [Charles Richard] Weld, the Assistant Secretary of the Royal Society; to Sir Charles Young | 1 November 1852 |
| MC/5/57 | Copy letter from Baron von Humboldt, Potsdam, to [William Henry Smyth], Foreign Secretary of the Royal Society | 9 November 1852 |
| MC/5/78 | Letter from W H [William Henry] Smyth, St John's Lodge, to Lord Rosse, [President of the Royal Society] | 23 December 1852 |
| MC/5/80 | Letter from Edward Sabine, [Treasurer of the Royal Society], Woolwich, to Thomas Bell, [Secretary of the Royal Society] | 4 January 1853 |
| MC/5/76 | Letter from John Phillips, St Mary's Lodge, York, to the Royal Society | 21 December 1852 |
| MC/5/237 | Letter from W H [William Henry] Smyth, St John's Lodge, near Aylesbury, to the Society | 1 April 1856 |
| MC/5/266 | Letter from W H [William Henry] Smyth, [Foreign Secretary of the Royal Society], St John's Lodge, to [Charles Richard] Weld, [Assistant Secretary of the Royal Society] | 23 November 1856 |
| MC/5 | Volume 5 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1851-1858 |
| MC/6/24 | Letter from W H [William Henry] Smyth, St John's Lodge, near Aylesbury, to Sir Benjamin [Collins Brodie], [President of the Royal Society] | 28 April 1859 |
| AP/18/5d | Unpublished copy of letter, regarding reports on the wreck of HMS Thetis from W H [William Henry]Smyth to J G [John George] Children | 19 April 1834 |
| MC/6 | Volume 6 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1859-1863 |
| AP/22/7 | Unpublished paper, 'De la chaleur du globe' [Paper on the heat of the Earth] by Demouville | 1838 |
| AP/18/5e | Unpublished letter, from W H [William Henry] Smyth to P M [Peter Mark] Roget | 19 April 1834 |
| AP/28/23 | Unpublished paper, 'On the decomposition and analysis of the compounds of ammonia and cyanogen' by Robert Smith | 24 November 1845 |
| AP/30/18 | Unpublished paper, 'Attempt to apply instrumental measurement to the zodiacal light' by Charles Piazzi Smyth | 25 March 1840 |
| AP/30/18/1 | Unpublished manuscript, 'Attempt to apply instrumental measurement to the zodiacal light' by Charles Piazzi Smyth | 25 March 1848 |
| RR/2/138 | Referee's report by William Henry Smyth, on a paper 'On the mean temperature of the observatory at Highfield House, near Nottingham, from the year 1810 to 1850' by Edward Joseph Lowe | 30 August 1851 |
| AP/37/20 | Unpublished letter, regarding the decimal compass card from James Share to W H [William Henry] Smyth | 18 February 1855 |
| AP/38/22 | Unpublished paper, 'On the application of photography to the physiognomic and mental phenomena of insanity' by Hugh W [Welch] Diamond | April 1856 |
| AP/28/23/1 | Unpublished manuscript, 'On the decomposition and analysis of the compounds of ammonia and cyanogen' by Robert Smith | 24 November 1845 |
| AP/33/24 | Unpublished paper, 'Experiments towards the construction of new forms of instruments for the correction of compass errors due to the presence of iron in ships; with investigations on the nature of the attraction of iron on the poles of magnets' by Julius Roberts | 1 February 1852 |
| RR/1/23 | Referee's report by William Henry Smyth, on a paper 'Planet Esaid’un nouveau catalogue sidéral, avec une réprésentation graphique, et une loi de simple et régulière distribution des étoiles autour du Pole, qui pourra fournir plusieurs avantages à I’ Astronomie pratique' by Joseph Bianchi | 16 October 1836 |
| RR/1/6 | Referee's report by William Henry Smyth, on a paper 'An account of a protracting pocket sextant' by E Bainbridge | 10 July 1845 |
| MS/257/4/221 | Letter from William Henry Smyth, St John's Lodge near Aylesbury to [Edward Sabine] | 15 April 1852 |
| RR/2/212 | Referee's report by William Henry Smyth, on a paper 'On the extension of the value of the ratio of the circumference of a circle to its diameter' by William Rutherford | 26 February 1853 |
| RR/2/259 | Referee's report by William Henry Smyth, on a paper 'On the results of periodical observations of the positions and distances of nineteen of the stars in Sir John Herschel’s lists of stars, favourably situated for the investigation of parallax, contained in part III. of the Philosophical Transactions for 1826, and part I. 1827' by John Wrottesley, 2nd Baron Wrottesley | 5 March 1851 |
| HSF/1/2/78 | Letter from W H [William Henry] Smyth, St John's Lodge, near Aylesbury, to Sir John [Frederick William Herschel] | 13 May 1862 |
| HSF/1/2/79 | Letter from W H [William Henry] Smyth, St John's Lodge, near Aylesbury, to Sir John [Frederick William Herschel] | 12 May 1863 |
| HSF/1/2/80 | Letter from W H [William Henry] Smyth, St John's Lodge, near Aylesbury, to Sir John [Frederick William Herschel] | 30 May 1863 |
| HSF/1/2/81 | Letter from W H [William Henry] Smyth, St John's Lodge, near Aylesbury, to Sir John [Frederick William Herschel] | 30 July 1864 |