| Reference Number | Title | Date |
| VM/1/2/O/12 | Joseph Francis O'Carroll | [early twentieth century] |
| VM/1/1/5 | Roll of Presidents Vol III - 1915- | [twentieth century] |
| RCPI/2/3/2/13/71 | Letter to the Registrar, Sir Patrick Dun's Hospital, Dublin | 20 October 1914 |
| RCPI/2/3/2/13/74 | Letter to the Secretary, Royal Bank of Ireland, Dublin | 20 October 1914 |
| RCPI/2/3/2/13/75 | Letter to Joseph O'Carroll, Vice-President RCPI | 20 October 1914 |
| RCPI/2/3/2/13/76 | Letter to the Secretary, Bank of Ireland, Dublin | 20 October 1914 |
| RCPI/2/3/2/13/78 | Letter to the Manager, Munster and Leinster Bank, Lr Baggott St. | 20 October 1914 |
| RCPI/2/3/2/13/115 | Letter to M J R Hayes, FRCSI, Dublin | 5 July 1915 |
| RCPI/2/3/2/13/122 | Letter to Dr O'Carroll, Royal College of Physicians of Ireland | [4 October 1915] |
| RCPI/2/3/2/13/124 | Letter to Dr O'Carroll | 4 October 1915 |
| RCPI/2/3/2/13/169 | Letter to the Registrar, Trinity College Dublin | 3 June 1916 |
| RCPI/2/3/2/13/188 | Letter to the Manager, Ulster Bank, Pembroke Branch | 19 October 1916 |
| RCPI/2/3/2/13/190 | Letter to the Secretary, Bank of Ireland, Dublin | 19 October 1916 |
| RCPI/2/3/1/58/Tau91/3 | Letter from Joseph O'Carroll, 43 Merrion Square, Dublin | 1 October 1916 |
| RCPI/2/3/1/58/Tau96/2 | Letter from Francis Webster, Oaks House, Beckley, Sussex | 17 November 1916 |
| RCPI/2/3/1/58/Tau105 | Letter from Jospeh O'Carroll | 6 October 1915 |
| RCPI/2/3/1/59/Upsilon2 | Letter from Harriet E Reed, Ivanhoe, Lansdowne Road, Dublin | 9 January 1917 |