| RefNo | Title | Date |
| IM/Maull/001747 | Gray, Andrew | nd |
| EC/1896/07 | Gray, Andrew: certificate of election to the Royal Society | |
| MS/377/1/59 | Letter from Andrew Gray, the University, Glasgow, to [William Fletcher] Barrett | 31 March 1906 |
| NLB/63/218 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Andrew] Gray, FRS | 18 July 1922 |
| NLB/7/758 | Copy letter from Herbert Rix, to Professor Andrew Gray, University College, Bangor | 20 April 1893 |
| NLB/7/767 | Copy letter from Herbert Rix, to Thomas Gray, Rose Polytechnic Institute, Terre Haute, Indiana, United States of America | 24 April 1893 |
| NLB/19/648 | Copy letter from an unknown correspondent, to Messrs Harrison & Sons | 16 December 1899 |
| NLB/23/1/113 | Copy letter from R Chapman, to Professor Andrew Gray, Fellow of the Royal Society | 24 September 1901 |
| NLB/13/440 | Copy letter from Theodore E James, to Professor Andrew Gray, Fellow of the Royal Society | 10 September 1896 |
| NLB/14/151 | Copy letter from Arthur William Rucker, to Richard Tetley Glazebrook, [Fellow of the Royal Society] | 13 January 1897 |
| RR/15/141 | Referee's report by Andrew Gray, on a paper 'The velocity of the ions produced in gases by rontgen rays' by John Zeleny | April 1900 |
| RR/15/149 | Referee's report by Andrew Gray, on a paper 'The mechanism of the electric arc' by Phoebe Sarah Hertha Marks Ayrton | December 1901 |
| RR/17/119 | Referee's report by Andrew Gray, on a paper 'A new current weigher and a determination of the electromotive force of the normal Weston cadmium cell' by William Edward Ayrton, Thomas Mather and Frank Edward Smith | 18 July 1907 |
| NLB/52/341 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor Andrew Gray, FRS | 12 November 1915 |
| NLB/20/257 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Gray, Fellow of the Royal Society, 11 University, Glasgow | 7 March 1900 |
| NLB/20/607 | Copy letter from Robert William Frederick Harrison, to Professor George Carey Foster, Fellow of the Royal Society | 30 May 1900 |
| NLB/22/172 | Copy letter from Robert William Frederick Harrison, to Professor [Andrew] Gray, Fellow of the Royal Society | 18 March 1901 |
| NLB/23/1/59 | Copy letter from Theodore E James, to Professor Andrew Gray, Fellow of the Royal Society, 11 The University, Glasgow | 3 September 1901 |
| NLB/22/433 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Gray, Fellow of the Royal Society | 14 May 1901 |
| NLB/23/2/473 | Copy letter from Joseph Larmor, to Professor Andrew Gray, Fellow of the Royal Society, and A Wood | 5 May 1904 |
| NLB/24/399 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Gray, Fellow of the Royal Society | 5 May 1902 |
| NLB/26/712 | Copy letter from Robert William Frederick Harrison to, Professor Andrew Gray, Fellow of the Royal Society | 18 May 1903 |
| NLB/26/600 | Copy letter from Robert William Frederick Harrison to, Professor Andrew Gray, Fellow of the Royal Society | 28 April 1903 |
| NLB/29/198 | Copy letter from Theodore E James, to Professor Andrew Gray, Fellow of the Royal Society | 28 July 1904 |
| NLB/32/122 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Gray, Fellow of the Royal Society | 9 January 1906 |
| NLB/36/146 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Gray, Fellow of the Royal Society, Madras House, St Andrews, Scotland | 22 August 1907 |
| NLB/44/200 | Copy letter from Joseph Larmor to [Andrew] Gray | 24 May 1911 |
| NLB/38/265 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Gray, Fellow of the Royal Society | [July 1908] |
| NLB/35/682 | Copy letter from Joseph Larmor, to Professor Andrew Gray, Fellow of the Royal Society | 3 July 1907 |
| NLB/37/31 | Copy letter from Robert William Frederick Harrison to Professor A [Andrew] Gray FRS | 13 January 1908 |
| NLB/38/133 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Gray, Fellow of the Royal Society, Grand Hotel de L'Etablissement, Wittel, Vosges | 18 June 1908 |
| NLB/46/764 | Copy letter from Robert William Frederick Harrison, to Professor [Andrew] Gray, Fellow of the Royal Society | 30 October 1912 |
| NLB/52/741 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor Andrew Gray, FRS | 21 February 1916 |
| NLB/56/887 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Andrew] Gray FRS | 20 June 1919 |
| RR/27/25 | Referee's report by Andrew Gray, on a paper 'On the richardson gyro-magnetic effect' by Arthur Price Chattock and Leslie Fleetwood Bates | July 1922 |
| NLB/55/142 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Andrew] Gray, FRS | 17 December 1917 |
| RR/13/138 | Referee's report by Andrew Grey, on a paper 'Magnetization of liquids' by John Sealy Edward Townsend | 2 July 1896 |
| RR/20/41 | Referee's report by Andrew Gray on a paper 'An experimental method for the production of vibrations on strings, illustrating the properties of loaded or unloaded telephone cables' by J A Fleming | 3 November 1913 |
| RR/14/40 | Referee's report by Andrew Gray, on a paper 'An extension of Maxwell's electro-magnetic theory of light to include dispersion, metallic reflection, and allied phenomena' by Edwin Edser | 7 March 1898 |
| NLB/68/766 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Alexander] Russell, FRS | 30 October 1925 |
| NLB/68/682 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [James Gordon] Gray | 13 October 1925 |
| NLB/63/230 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Andrew] Gray, FRS | 20 July 1922 |
| RR/15/179 | Referee's report by Professor Andrew Gray, on a paper 'The resistive and electromotive forces of the electric arc' by William Duddell | December 1901 |
| RR/15/315 | Referee's report by Andrew Gray, on a paper 'An experimental determination of the variation of the critical velocity of water with temperature' by Ernest George Coker and S B Clement | October 1902 |
| NLB/44/39 | Copy letter from Robert William Frederick Harrison to Professor A [Andrew] Gray FRS | 26 April 1911 |
| RR/16/197 | Referee's report by Andrew Gray, on a paper 'The effects of changes of temperature on the modulus of torsional rigidity of metal wires' by Frank Horton | 10 April 1904 |
| AP/74/14 | Unpublished paper, 'On the relation between the electrical resistances of pure metals and their molecular constants' by W Williams | 1901 |
| PP/4/26 | Paper, 'On a new reflecting galvanometer of great sensibility, and on new forms of astatic galvanometers' by Thomas Gray and Andrew Gray | 1884 |
| PP/4/26/1 | Manuscript, 'On a new reflecting galvanometer of great sensibility, and on new forms of astatic galvanometers' by Thomas Gray and Andrew Gray | 1884 |
| PP/4/26/2 | Diagrams, galvanometers by Thomas Gray and Andrew Gray | 1884 |
| PP/4/45 | Paper, 'On the relation between the electrical qualities and the chemical composition of glass and allied substances. Part I' by Thomas Gray, Andrew Gray and J J [James Johnston] Dobbie | 1884 |
| RR/28/14 | Referee's report by Andrew Gray, on a paper 'On an electromagnetic method for the measurement of the horizontal intensity of the earth's magnetic field' by Frank Edward Smith | 22 April 1922 |