List of United Kingdom Parliamentary constituencies in Ireland 1801–1885

There were a total of 100 MPs representing Ireland in the United Kingdom Parliament in 1800. From 1801 to 1832, these were divided into 66 constituencies for elections to the United Kingdom Parliament. There were 33 borough constituencies, 1 university constituency and 32 county constituencies. There were 2 two-member and 31 one-member borough constituencies. The university constituency returned one member. All the county constituencies had two members.

In 1832-1870, except for some minor boundary changes, the 66 constituencies were unchanged. Belfast, Galway Borough, Limerick City, Waterford City and Dublin University gained a second seat. The total number of seats was increased to 105.

Cashel and Sligo Borough were disenfranchised for corruption in 1870, reducing the number of constituencies to 64 and seats to 103.

In the Redistribution of Seats Act 1885, there was a substantial revision of constituencies, with many borough constituencies abolished. These new constituencies were first used at the 1885 United Kingdom general election in Ireland.

1. Antrim CC, (2 members).
2. Armagh City BC, County Armagh (1 member).
3. Armagh County CC, (2 members).
4. Athlone BC, County Westmeath (1 member).
5. Bandon BC, County Cork (1 member).
6. Belfast BC, County Antrim (1 member 1801-1832; 2 members 1832-1885).
7. Carlow Borough BC, County Carlow (1 member).
8. Carlow County CC, (2 members).
9. Carrickfergus BC, County Antrim (1 member).
10. Cashel BC, County Tipperary (1 member 1801-1870).
11. Cavan CC, (2 members).
12. Clare CC, (2 members).
13. Clonmel BC, County Tipperary (1 member).
14. Coleraine BC, County Londonderry (1 member).
15. Cork City BC, County Cork (2 members).
16. Cork County CC, (2 members).
17. Donegal CC, (2 members).
18. Down CC, (2 members).
19. Downpatrick BC, County Down (1 member).
20. Drogheda BC, County Louth (1 member).
21. Dublin City BC, County Dublin (2 members).
22. Dublin County CC, (2 members).
23. Dublin University UC, County Dublin (1 member 1801-1832; 2 members 1832-1885).
24. Dundalk BC, County Louth (1 member).
25. Dungannon BC, County Tyrone (1 member).
26. Dungarvan BC, County Waterford (1 member).
27. Ennis BC, County Clare (1 member).
28. Enniskillen BC, County Fermanagh (1 member).
29. Fermanagh CC, (2 members).
30. Galway Borough BC, County Galway (1 member 1801-1832; 2 members 1832-1885).
31. Galway County CC, (2 members).
32. Kerry CC, (2 members).
33. Kildare CC, (2 members).
34. Kilkenny City BC, County Kilkenny (1 member).
35. Kilkenny County CC, (2 members).
36. King's County CC, (2 members).
37. Kinsale BC, County Cork (1 member).
38. Leitrim CC, (2 members).
39. Limerick City BC, County Limerick (1 member 1801-1832; 2 members 1832-1885).
40. Limerick County CC, (2 members).
41. Lisburn BC, County Antrim (1 member).
42. Londonderry City BC, County Londonderry (1 member).
43. Londonderry County CC, (2 members).
44. Longford CC, (2 members).
45. Louth CC, (2 members).
46. Mallow BC, County Cork (1 member).
47. Mayo CC, (2 members).
48. Meath CC, (2 members).
49. Monaghan CC, (2 members).
50. New Ross BC, County Wexford (1 member).
51. Newry BC, County Down (1 member).
52. Portarlington BC, Queen's County (1 member).
53. Queen's County CC, (2 members).
54. Roscommon CC, (2 members).
55. Sligo Borough BC, County Sligo (1 member 1801-1870).
56. Sligo County CC, (2 members).
57. Tipperary CC, (2 members).
58. Tralee BC, County Kerry (1 member).
59. Tyrone CC, (2 members).
60. Waterford City BC, County Waterford (1 member 1801-1832; 2 members 1832-1885).
61. Waterford County CC, (2 members).
62. Westmeath CC, (2 members).
63. Wexford Borough BC, County Wexford (1 member).
64. Wexford County CC, (2 members).
65. Wicklow CC, (2 members).
66. Youghal BC, County Cork (1 member).