Members of the 1st UK Parliament from Ireland

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Antrim
2 members

| Rt Hon. John Staples

|

|

| Edmond Alexander MacNaghten

|

| Classified Tory in the 2nd Parliament

| 1801, 1 January

|rowspan="2"| Armagh

|rowspan="2"| Patrick Duigenan

|rowspan="2"| Tory

| Appointed Commissioner of Compensation 1801

| 1801, 2 March{{efn|name=unopp|An unopposed return (applies to by-elections only).}}

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Armagh
2 members

| Hon. Archibald Acheson

|

| Classified Tory in the 2nd Parliament

| Robert Camden Cope

|

|

| 1801, 1 January

| Athlone

| William Handcock

|

|

| 1801, 1 January

| Bandon

| Sir Broderick Chinnery, Bt

| Whig

|

| 1801, 1 January

| Belfast

| James Edward May

| Tory

|

| 1801, 1 January

|rowspan="3"| Carlow

| Hon. Henry Sadleir Prittie

|

| The 2nd Baron Dunalley from 3 January 1801

| 1801, 21 March{{efn|name=unopp}}

| Hon. Francis Aldborough Prittie

|

| Resigned

| 1801, 30 July{{efn|name=unopp}}

| Charles Montague Ormsby

| Tory

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Carlow
2 members

| William Henry Burton

|

|

| Sir Richard Butler, Bt

|

|

| 1801, 1 January

| Carrickfergus

| Noah Dalway

|

|

| 1801, 1 January

|rowspan="2"| Cashel

| Richard Bagwell

|

| Resigned

| 1801, 9 December{{efn|name=unopp}}

| John Bagwell (c. 1780-1806)

|

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Cavan
2 members

| Francis Saunderson

| Whig

|

| Nathaniel Sneyd

| Tory

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Clare
2 members

| Hon. Francis Nathaniel Burton

|

|

| Hugh Dillon Massy

|

|

| 1801, 1 January

|rowspan="2"| Clonmel

| seat vacant

|

| No co-option (both Irish Parliament seats vacant)

| 1801, 13 February{{efn|name=unopp}}

| Rt Hon. William Bagwell

| Tory

|

| 1801, 1 January

| Coleraine

| Walter Jones

| Tory

|

|rowspan="2"| 1801, 1 January

|rowspan="3"| Cork
2 members

| Hon. John Hely-Hutchinson

| Whig

| Created 1st Baron Hutchinson 1801

| Mountifort Longfield

| Tory

|

| 1802, 8 January{{efn|name=unopp}}

| Hon. Christopher Hely-Hutchinson

| Whig

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Cork
2 members

| Viscount Boyle

|

| Classified Whig in the 3rd Parliament

| Robert Uniacke Fitzgerald

|

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Donegal
2 members

| Henry Vaughan Brooke

| Tory

|

| Viscount Sudley

| Tory

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Down
2 members

| Viscount Castlereagh

| Tory

|

| Francis Savage

|

|

| 1801, 1 January

|rowspan="2"| Downpatrick

| Clotworthy Rowley

|

| Appointed Commissioner of Compensation 1801

| 1801, 10 March{{efn|name=unopp}}

| Samuel Campbell Rowley

|

|

| 1801, 1 January

| Drogheda

| Edward Hardman

|

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| Dublin
2 members

| John Claudius Beresford

| Tory

|

| Rt Hon. George Ogle

| Tory

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Dublin
2 members

| Hans Hamilton

| Tory

|

| Frederick John Falkiner

| Tory

|

| 1801, 1 January

| Dublin University

| Hon. George Knox

| Tory

|

| 1801, 1 January

|rowspan="2"| Dundalk

| seat vacant

|

| No co-option (both Irish Parliament seats vacant)

| 1801, 28 February{{efn|name=unopp}}

| Rt Hon. Isaac Corry

| Tory

|

| 1801, 1 January

|rowspan="2"| Dungannon

| Hon. John Knox

|

| Died

| 1801, 21 November{{efn|name=unopp}}

| Sir Charles Hamilton, Bt

|

| Classified Tory in the 2nd Parliament

| 1801, 1 January

| Dungarvan

| Edward Lee

| Whig

|

| 1801, 1 January

| Ennis

| John Ormsby Vandeleur

| Tory

|

| 1801, 1 January

| Enniskillen

| Hon. Arthur Cole Hamilton

| Tory

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Fermanagh
2 members

| Mervyn Archdall (senior)

| Tory

|

| Viscount Cole

| Tory

|

| 1801, 1 January

|rowspan="2"| Galway

| St. George Daly

|

| Resigned

| 1801, 10 March{{efn|name=unopp}}

| John Brabazon Ponsonby

| Whig

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Galway
2 members

| Richard Le Poer Trench

|

|

| Richard Martin

|

|

|rowspan="2"| 1801, 1 January

|rowspan="3"| County Kerry
2 members

| James Crosbie

| Tory

|

|rowspan="2"| Rt Hon. Maurice Fitzgerald
(The 18th Knight of Kerry)

|rowspan="2"| Whig

| Appointed Commissioner of the Treasury 1801

| 1801, 5 March{{efn|name=unopp}}

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Kildare
2 members

| Maurice Keatinge

|

|

| John La Touche

| Whig

| Not John La Touche, MP elected 1802

| 1801, 1 January

|rowspan="2"| Kilkenny

| William Talbot

|

| Resigned

| 1802, 2 March{{efn|name=unopp}}

| Richard Archdall

|

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Kilkenny
2 members

| Hon. James Wandesford Butler

| Whig

|

| Rt Hon. William Brabazon Ponsonby

| Whig

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| King's County
2 members

| Sir Lawrence Parsons, Bt

|

| Classified Tory in the 2nd Parliament

| Denis Bowes Daly

| Tory

|

| 1801, 1 January

|rowspan="2"| Kinsale

|rowspan="2"| William Rowley

|rowspan="2"|

| Appointed Commissioner of Irish Revenue 1801

| 1801, 20 February{{efn|name=unopp}}

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Leitrim
2 members

| Viscount Clements

| Whig

|

| Rt Hon. Theophilus Jones

| Tory

|

| 1801, 1 January

| Limerick

| Henry Deane Grady

|

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Limerick
2 members

| John Waller

|

|

| William Odell

|

| Classified Tory in the 4th Parliament

| 1801, 1 January

| Lisburn

| George Hatton

| Tory

|

| 1801, 1 January

| Londonderry

| Henry Alexander

|

|

|rowspan="2"| 1801, 1 January

|rowspan="3"| County Londonderry
2 members

| Hon. Charles William Stewart

| Tory

|

| seat vacant

|

| Beresford became Marquess of Waterford 1800

| 1801, 14 January {{efn|name=unopp}}

| Sir George Fitzgerald Hill, Bt

| Tory

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Longford
2 members

| Sir Thomas Fetherston, Bt

|

| Classified Tory in the 3rd Parliament

| Sir William Gleadowe-Newcomen, Bt

|

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Louth
2 members

| John Foster

|

| Classified Tory in the 2nd Parliament

| William Charles Fortescue

|

|

| 1801, 1 January

| Mallow

| John Longfield

|

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Mayo
2 members

| Rt Hon. Denis Browne

|

| Classified Tory in the 2nd Parliament

| George Jackson

|

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Meath
2 members

| Hamilton Gorges

|

|

| Sir Marcus Somerville, Bt

|

| Classified Whig in the 2nd Parliament

|rowspan="2"| 1801, 1 January

|rowspan="3"| County Monaghan
2 members

| Richard Dawson

|

|

| Warner William Westenra

|

| Succeeded as 2nd Baron Rossmore on 6 August 1801

| 1801, 1 December{{efn|name=unopp}}

| Charles Powell Leslie II

| Tory

|

| 1801, 1 January

| New Ross

| Robert Leigh

|

|

| 1801, 1 January

| Newry

| John Moore

|

|

| 1801, 1 January

|rowspan="2"| Portarlington

| Frederick Trench

|

| Created the 1st Baron Ashtown on 27 December 1800 and never sat, though elected

| 1801, 5 March{{efn|name=unopp}}

| William Elliot

|

|

|rowspan="2"| 1801, 1 January

|rowspan="4"| Queen's County
2 members

| Sir John Parnell, Bt

|

| Died 6 December 1801

| Rt Hon. Charles Henry Coote

|

| The 2nd Baron Castle Coote from 1 March 1802

| 1801, 28 December{{efn|name=unopp}}

| Hon. William Wellesley-Pole

|

|

| 1802, 5 April{{efn|name=unopp}}

| Henry Brooke Parnell

|

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Roscommon
2 members

| Arthur French

| Whig

|

| Thomas Mahon

| Whig

|

| 1801, 1 January

| Sligo

| Owen Wynne

| Tory

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Sligo
2 members

| Joshua Edward Cooper

| Tory

|

| Charles O'Hara

| Whig

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Tipperary
2 members

| Viscount Mathew

|

|

| John Bagwell (c. 1752-1816)

|

|

| 1801, 1 January

| Tralee

| Arthur Moore

|

|

|rowspan="2"| 1801, 1 January

|rowspan="3"| County Tyrone
2 members

| Viscount Corry

|

| The 2nd Earl Belmore from 2 February 1802

| James Stewart

|

|

| 1802, 1 March{{efn|name=unopp}}

| Rt Hon. John Stewart

|

|

| 1801, 1 January

| Waterford

| William Congreve Alcock

| Tory

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Waterford
2 members

| Rt Hon. John Beresford

| Tory

|

| Richard Power

| Whig

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Westmeath
2 members

| William Smyth

|

|

| Gustavus Hume-Rochfort

|

| Classified Tory in the 5th Parliament

| 1801, 1 January

|rowspan="2"| Wexford

| Francis Leigh

|

| Resigned

| 1801, 20 February{{efn|name=unopp}}

| Ponsonby Tottenham

|

|

|rowspan="2"| 1801, 1 January

|rowspan="2"| County Wexford
2 members

| Viscount Loftus

| Tory

|

| Abel Ram

| Tory

|

|rowspan="2"| 1801, 1 January

|rowspan="3"| County Wicklow
2 members

| William Hoare Hume

| Whig

|

| seat vacant

|

| Death of Westby on 30 November 1800

| 1801, February

| George Ponsonby

| Whig

| First contested UK election, in Ireland

| 1801, 1 January

| Youghal

| Sir John Keane, Bt

| Tory

| Created baronet 1 August 1801