| RefNo | Title | Date |
| EC/1894/02 | Poincare, Jules Henri: certificate of election to the Royal Society | |
| M/189 | Poincare, Henri | |
| NLB/9/387 | Copy letter from Theodore E James to Messrs Harrison & Sons | 11 May 1894 |
| RR/15/238 | Referee's report by George Howard Darwin, on a paper 'Sur la stabilite de l'equilibre des figures pyriformes affectees par une masse fluide en rotation' by Jules Henri Poincare | November 1901 |
| NLB/23/2/215 | Copy letter from Joseph Larmor, to Professor Jules Henri Poincare, Foreign Member of the Royal Society | 24 June 1902 |
| NLB/23/2/145 | Copy letter from Alfred Bray Kempe, to Professor [Jules] Henri Poincare | 4 December 1901 |
| NLB/23/2/132 | Copy letter from unknown correspondent, to Professeur [Jules] Henri Poincare, Foreign Member of the Royal Society | November 1901 |
| NLB/23/1/509 | Copy letter from Robert William Frederick Harrison, to Professor Jules Henri Poincare, Foreign Member, Royal Society, 63 Rue Claude Bernard, Paris | 23 November 1901 |
| NLB/25/761 | Copy letter from Robert William Frederick Harrison, to Monsieur Jules Henry Poincare, [Fellow of the Royal Society], Paris | 19 December 1902 |
| NLB/25/783 | Copy letter from Robert William Frederick Harrison, to Jules Henri Poincare, [Foreign Member, Royal Society] | 1 January 1903 |
| RR/15/239 | Referee's report by Ernest William Hobson, on a paper 'Sur la stabilite de l'equilibre des figures pyriformes affectees par une masse fluide en rotation' by Jules Henri Poincare | November 1901 |
| NLB/17/407 | Copy letter from [Michael Foster], to Monsieur le Professeur Jules Henri Poincare, Foreign Member of the Royal Society, Ecole Polytechnique, Paris | 25 October 1898 |
| NLB/18/150 | Copy letter from Arthur William Rucker, to Professor Poincare | 24 January 1899 |
| PP/18/9 | Paper, 'On instability of periodic motion' by William Thomson | 1891 |
| MC/16/124 | Letter from Jules Henri Poincare, Lozère, to the President of the Royal Society | 28 May 1894 |
| MC/16 | Volume 16 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1893-1896 |