| Reference number | Title | Date |
| MS/377/1/2 | Letter from John Aitken, Ardenlea, Falkirk, to [William Fletcher] Barrett | 13 March 1906 |
| IM/000052 | Aitken, John | nd |
| IM/000051 | Aitken, Alexander Craig | nd |
| NLB/6/105 | Copy letter from Herbert Rix, to John Aitken, Fellow of the Royal Society | 2 March 1892 |
| NLB/6/425 | Copy letter from Herbert Rix, to John Aitken, Fellow of the Royal Society, Hotel Belle Vue, Baveno, Lago Maggiore, Italy | 9 May 1892 |
| NLB/13/337 | Copy letter from Robert William Frederick Harrison, to Messrs Harrison & Sons | 28 July 1896 |
| NLB/14/873 | Copy letter from an unknown correspondent, to Messrs Harrison & Sons | 1 June 1897 |
| RR/16/1 | Referee's report by Joseph Larmor and William James Russell, on a paper 'the formation of definite figures by the deposition of dust' by John Aitken | 23 July 1903 |
| NLB/23/2/407 | Copy letter from Joseph Larmor, to John Aitken, Fellow of the Royal Society | 11 December 1903 |
| MC/20/370 | Note from [William Napier] Shaw | [1905] |
| NLB/57/492 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to unknown correspondent | 17 November 1919 |
| NLB/54/867 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to John Aitken Esquire, FRS | 24 October 1917 |
| NLB/55/77 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr. John Aitken, FRS | 23 November 1917 |
| NLB/55/57 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr. John Aitken, FRS | 19 November 1917 |
| NLB/57/546 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Sir [William] Napier Shaw, FRS | 1 December 1919 |
| RR/14/107 | Referee's report by John Aitken, on a paper 'On the condensation nuclei produced in gases by the action of Röntgen rays. Uranium rays, ultra-violet light, and other agents' by Charles Thomson Rees Wilson | 5 December 1898 |
| RR/13/312 | Referee's report by John Aitken, on a paper 'Condensation of water vapour in the presence of dust-free air and other gases' by Charles Thomson Rees Wilson | 22 March 1896 |
| RR/14/273 | Referee's report by John Aitken, on a paper 'On the comparative efficiency as condensation nuclei of positively and negatively charged ions' by Charles Thomson Rees Wilson | 21 June 1899 |
| EC/1889/03 | Aitken, John: certificate of election to the Royal Society | |
| NLB/14/636 | Copy letter from Arthur William Rucker, to Richard Tetley Glazebrook, [Fellow of the Royal Society] | 12 April 1897 |
| NLB/54/909 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to the Deputy Master of the [Royal] Mint | 2 November 1917 |
| PP/19/12 | Paper, 'On some phenomena connected with cloudy condensation' by John Aitken | 1892 |
| NLB/38/662 | Copy letter from Robert William Frederick Harrison, to Dr John Aitken, Fellow of the Royal Society, Ardenlea, Falkirk | 20 October 1908 |
| MC/23/6 | Letter from John Aitken, Adrenlea, Falkirk, to the Secretary of The Royal Society | 19 October 1908 |
| MC/23 | Volume 23 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1908 |
| NLB/44/508 | Copy letter from Robert William Frederick Harrison to John Aitken FRS, Ardenlea, Falkirk | 24 July 1911 |
| MC/26/5 | Letter from John Aitken, Ardenlea, Falkirk, to the [Royal Society] | 22 July 1911 |
| MC/20 | Volume 20 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1905 |
| MC/32/7 | Letter from John Aitken, Ardenlea, Falkirk, to [Robert] Harrison, [Royal Society] | 20 November 1917 |
| MC/32/6 | Letter from John Aitken, Ardenlea, Falkirk, to [Robert] Harrison, [Royal Society] | 17 November 1917 |