The 1921 Mid Down by-election was held on 2 July 1921. The by-election was held due to the incumbent Ulster Unionist MP, James Craig, being elected Prime Minister of Northern Ireland. It was won by the UUP candidate Robert Sharman-Crawford.^[1]

References

^ Leigh Rayment's Historical List of MPs

v t e By-elections in Northern Ireland to the House of Commons of the United Kingdom
1920s	June 1921: Mid Armagh Belfast Duncairn North Down July 1921: Mid Down West Down August 1921: South Londonderry January 1922: South Londonderry February 1922: West Down North Down June 1922: North Londonderry July 1922: North Down January 1929: Londonderry
1930s	March 1931: Fermanagh and Tyrone June 1934: Fermanagh and Tyrone May 1939: Down
1920s	February 1940: Belfast East November 1940: Queen's University of Belfast February 1943: Belfast West Antrim June 1946: Down March 1948: Armagh
1950s	November 1950: Belfast West May 1951: Londonderry October 1952: North Antrim November 1952: Belfast South April 1953: North Down November 1954: Armagh August 1955: Mid Ulster May 1956: Mid Ulster March 1959: Belfast East
1960s	October 1963: Belfast South April 1969: Mid Ulster
1970s	None
1980s	April 1981: Fermanagh and South Tyrone August 1981: Fermanagh and South Tyrone March 1982: Belfast South January 1986: Antrim North Antrim East Antrim South Belfast East Belfast North Belfast South Down North Down South Fermanagh and South Tyrone Lagan Valley East Londonderry Mid Ulster Strangford Newry and Armagh Upper Bann
1990s	May 1990: Upper Bann June 1995: North Down
2000s	September 2000: South Antrim
2010s	June 2011: Belfast West March 2013: Mid Ulster May 2018: West Tyrone
2020s	None to date
Lists of UK by-elections 1801–1806 1806–1818 1818–1832 1832–1847 1847–1857 1857–1868 1868–1885 1885–1900 1900–1918 1918–1931 1931–1950 1950–1979 1979–2010 2010–present Northern Ireland Hereditary peers

v t e « 30th Parliament « By-elections to the 31st Parliament of the United Kingdom » 32nd Parliament »
1919	February: Liverpool West Derby March: Leyton West North Londonderry Oxford University Hull Central April: Aberdeenshire and Kincardineshire Central May: East Antrim July: Swansea East Bothwell Dublin University August: Widnes September: Pontefract October: Manchester Rusholme November: Chester-le-Street Croydon South Isle of Thanet Plymouth Sutton December: St Albans Bromley Spen Valley
1920	January: Ashton-under-Lyne February: The Wrekin Paisley Horncastle March: Argyll Dartford Stockport Basingstoke Camberwell North West April: Northampton Edinburgh North Edinburgh South Sunderland June: Louth Nelson and Colne July: Ebbw Vale South Norfolk Woodbridge September: Ilford November: Hemel Hempstead The Wrekin Middleton and Prestwich December: Abertillery Rhondda West
1921	January: Hereford Dover February: Cardiganshire March: Woolwich East Dudley Birmingham Moseley Kirkcaldy Burghs Penistone Birmingham West April: Taunton Bristol West Glasgow Pollok East Dorset Bewdley Eddisbury Bedford Chichester May: Hastings Penrith and Cockermouth Abingdon Orkney and Shetland June: Belfast Duncairn Mid Armagh North Down West Down July: Mid Down Westminster St George's Heywood and Radcliffe Hertford August: Caerphilly Westminster Abbey South Londonderry September: Lewisham West Louth October: Westhoughton November: Hornsey December: Southwark South East
1922	January: Ludlow Tamworth South Londonderry February: West Down Manchester Clayton Camberwell North North Down Bodmin March: Wolverhampton West Liverpool Exchange Cambridge Inverness Chertsey Leicester East May: Clapham City of London June: North Londonderry Newbury Moray and Nairn Banbury Nottingham East July: Gower North Down Pontypridd August: Hackney South October: Newport
Lists of UK by-elections 1801–1806 1806–1818 1818–1832 1832–1847 1847–1857 1857–1868 1868–1885 1885–1900 1900–1918 1918–1931 1931–1950 1950–1979 1979–2010 2010–present Northern Ireland Hereditary peers