*The [[flag of the United Kingdom]], the [[Union Jack]] or Union Flag, is the only flag routinely used officially by the sovereign [[Government of the United Kingdom|UK government]], as well as being flown on most council buildings in Northern Ireland.{{cite web|url= http://www.niassembly.gov.uk/adhocs/flags/flags.pdf|title= The Flags Regulations (Northern Ireland) 2000|access-date= 5 October 2011|work= [[Northern Ireland Assembly]]|archive-url= https://web.archive.org/web/20110829141756/http://www.niassembly.gov.uk/adhocs/flags/flags.pdf|archive-date= 29 August 2011|url-status= dead}} The Union Flag is often flown by [[Unionism in Ireland|unionists]] but is disliked by [[Irish nationalism|nationalists]]. British law states that the Union Flag must be flown on designated days from central government buildings in Northern Ireland.[http://www.legislation.gov.uk/nisr/2000/347/contents/made The Flags Regulations (Northern Ireland) 2000]

*The [[flag of the United Kingdom]], the [[Union Jack]] or Union Flag, is the only flag routinely used officially by the sovereign [[Government of the United Kingdom|UK government]], as well as being flown on most council buildings in Northern Ireland.{{cite web|url= http://www.niassembly.gov.uk/adhocs/flags/flags.pdf|title= The Flags Regulations (Northern Ireland) 2000|access-date= 5 October 2011|work= [[Northern Ireland Assembly]]|archive-url= https://web.archive.org/web/20110829141756/http://www.niassembly.gov.uk/adhocs/flags/flags.pdf|archive-date= 29 August 2011|url-status= dead}} The Union Flag is often flown by [[Unionism in Ireland|unionists]] but is disliked by [[Irish nationalism|nationalists]]. British law states that the Union Flag must be flown on designated days from central government buildings in Northern Ireland.[http://www.legislation.gov.uk/nisr/2000/347/contents/made The Flags Regulations (Northern Ireland) 2000]

*The [[Ulster Banner]], the flag of the pre-1973 [[Executive Committee of the Privy Council of Northern Ireland|government of Northern Ireland]], was used from 1953 to 1972 by the [[Parliament Buildings (Northern Ireland)|Stormont]] government to represent the government of Northern Ireland.Encyclopædia Britannica says: According to British tradition, a coat of arms or flag is granted to the government of a territory, not to the people residing there That government was granted a royal warrant to fly the Ulster Banner in 1924, but this expired when the government was dissolved under the [[Northern Ireland Constitution Act 1973]]. It continues to be used by some sports teams representing Northern Ireland internationally, for example by the [[Northern Ireland national football team|Northern Ireland football team]],{{cite web |url= https://www.fifa.com/associations/association=nir/index.html|archive-url= https://web.archive.org/web/20070614054719/http://www.fifa.com/associations/association=nir/index.html|url-status= dead|archive-date= 14 June 2007|title= Northern Ireland|access-date=5 October 2011 |work= [[FIFA]]}} and by the [[Northern Ireland at the Commonwealth Games|Northern Ireland]] [[Commonwealth Games]] team.[http://www.commonwealthgames.com/ Commonwealth Games website] {{webarchive|url=https://web.archive.org/web/20080723215731/http://www.commonwealthgames.com/ |date=23 July 2008 }}. Choose "Northern Ireland" from the "Countries" menu.

*The [[Ulster Banner]], the flag of the pre-1973 [[Executive Committee of the Privy Council of Northern Ireland|government of Northern Ireland]], was used from 1953 to 1972 by the [[Parliament Buildings (Northern Ireland)|Stormont]] government to represent the government of Northern Ireland.Encyclopædia Britannica says: According to British tradition, a coat of arms or flag is granted to the government of a territory, not to the people residing there That government was granted a royal warrant to fly the Ulster Banner in 1924, but this expired when the government was dissolved under the [[Northern Ireland Constitution Act 1973]]. It continues to be used by some sports teams representing Northern Ireland internationally, for example by the [[Northern Ireland national football team|Northern Ireland football team]],{{cite web |url= https://www.fifa.com/associations/association=nir/index.html|archive-url= https://web.archive.org/web/20070614054719/http://www.fifa.com/associations/association=nir/index.html|url-status= dead|archive-date= 14 June 2007|title= Northern Ireland|access-date=5 October 2011 |work= [[FIFA]]}} and by the [[Northern Ireland at the Commonwealth Games|Northern Ireland]] [[Commonwealth Games]] team.[http://www.commonwealthgames.com/ Commonwealth Games website] {{webarchive|url=https://web.archive.org/web/20080723215731/http://www.commonwealthgames.com/ |date=23 July 2008 }}. Choose "Northern Ireland" from the "Countries" menu.

*A white banner displaying the emblem of the [[Northern Ireland Assembly]] is used to represent Northern Ireland within organisations such as the [[Commonwealth Parliamentary Association]].https://x.com/CPA_BIMR/status/2027427781668221097/photo/1

*A banner displaying the emblem of the [[Northern Ireland Assembly]] is used to represent Northern Ireland within organisations such as the [[Commonwealth Parliamentary Association]].https://x.com/CPA_BIMR/status/2027427781668221097/photo/1https://x.com/CPA_BIMR/status/1651228223542292482/photo/1

*The [[flag of Ireland]] or Irish tricolour is the [[State (polity)|state]] flag of the [[Republic of Ireland]], disliked by [[Unionism in Ireland|Unionists]] and is regarded by [[Irish republicanism|republicans]] and nationalists as the flag of all of [[Ireland]]. It has sometimes been mistakenly used to represent Northern Ireland by Great Britain-based bodies, such as the BBC.{{cite web | url=https://www.belfastlive.co.uk/news/northern-ireland/irish-tricolour-makes-surprise-appearance-24150497 |first1=Alison |last1=O'Reilly |website=Belfast Live | title=Irish tricolour makes surprise appearance at Queen's Jubilee concert | date=5 June 2022 }}{{cite web | url=https://extra.ie/2020/09/04/news/world-news/bbc-northern-ireland-flag-irish | title='Disgraceful!' – Irish flag mix-up causes outrage as BBC issue apology |website=Extra.ie |first1=Aoibhin |last1=Bryant | date=4 September 2020 }}

*The [[flag of Ireland]] or Irish tricolour is the [[State (polity)|state]] flag of the [[Republic of Ireland]], disliked by [[Unionism in Ireland|Unionists]] and is regarded by [[Irish republicanism|republicans]] and nationalists as the flag of all of [[Ireland]]. It has sometimes been mistakenly used to represent Northern Ireland by Great Britain-based bodies, such as the BBC.{{cite web | url=https://www.belfastlive.co.uk/news/northern-ireland/irish-tricolour-makes-surprise-appearance-24150497 |first1=Alison |last1=O'Reilly |website=Belfast Live | title=Irish tricolour makes surprise appearance at Queen's Jubilee concert | date=5 June 2022 }}{{cite web | url=https://extra.ie/2020/09/04/news/world-news/bbc-northern-ireland-flag-irish | title='Disgraceful!' – Irish flag mix-up causes outrage as BBC issue apology |website=Extra.ie |first1=Aoibhin |last1=Bryant | date=4 September 2020 }}

*The [[Saint Patrick's Saltire]] represents Northern Ireland indirectly as [[Ireland]] in the Union Jack. It is sometimes flown during [[Saint Patrick's Day]] parades in Northern Ireland,{{cite book |last=Groom |first=Nick |author-link=Nick Groom |chapter=Union Jacks and Union Jills |editor-last1=Eriksen |editor-first1=Thomas Hylland |editor-link1=Thomas Hylland Eriksen |editor-last2=Jenkins |editor-first2=Richard |title=Flag, Nation and Symbolism in Europe and America |publisher=Routledge |year=2007 |pages=68–87 |isbn=978-0-415-44404-0 |chapter-url=https://books.google.com/books?id=scHXHTkRmZcC&pg=PA68 |location=Abingdon |lccn=2007018505 |oclc=123968978 |ol=9353071W}} and is used to represent Northern Ireland during some royal events.{{cite web |url=http://www.flaginstitute.org/Thames_Pageant_Flag_Guide.pdf |title=A Visual Guide to the Flags used in the Thames Diamond Jubilee Pageant |last=Bartram |first=Graham |author-link=Graham Bartram |year=2012 |publisher=[[Flag Institute]] |page=5 |access-date=22 August 2015 |archive-url=https://web.archive.org/web/20121108075308/http://www.flaginstitute.org/Thames_Pageant_Flag_Guide.pdf |archive-date=8 November 2012}}

*The [[Saint Patrick's Saltire]] represents Northern Ireland indirectly as [[Ireland]] in the Union Jack. It is sometimes flown during [[Saint Patrick's Day]] parades in Northern Ireland,{{cite book |last=Groom |first=Nick |author-link=Nick Groom |chapter=Union Jacks and Union Jills |editor-last1=Eriksen |editor-first1=Thomas Hylland |editor-link1=Thomas Hylland Eriksen |editor-last2=Jenkins |editor-first2=Richard |title=Flag, Nation and Symbolism in Europe and America |publisher=Routledge |year=2007 |pages=68–87 |isbn=978-0-415-44404-0 |chapter-url=https://books.google.com/books?id=scHXHTkRmZcC&pg=PA68 |location=Abingdon |lccn=2007018505 |oclc=123968978 |ol=9353071W}} and is used to represent Northern Ireland during some royal events.{{cite web |url=http://www.flaginstitute.org/Thames_Pageant_Flag_Guide.pdf |title=A Visual Guide to the Flags used in the Thames Diamond Jubilee Pageant |last=Bartram |first=Graham |author-link=Graham Bartram |year=2012 |publisher=[[Flag Institute]] |page=5 |access-date=22 August 2015 |archive-url=https://web.archive.org/web/20121108075308/http://www.flaginstitute.org/Thames_Pageant_Flag_Guide.pdf |archive-date=8 November 2012}}

*Other flags flown by republicans include the [[Starry Plough (flag)|Starry Plough]], the [[Sunburst flag]] and even the [[flag of Ulster|flag of the Ulster province]]. [[Ulster loyalism|Loyalists]] sometimes display the [[flag of Scotland]] as a sign of their Scottish ancestry. [[Ulster nationalism|Ulster nationalists]] use the unofficial [[List of flags used in Northern Ireland#Ulster Nation flag|'Ulster Nation flag']], although it has now been adopted as an [[Ulster Scots people|Ulster-Scots]] flag.

*Other flags flown by republicans include the [[Starry Plough (flag)|Starry Plough]], the [[Sunburst flag]] and even the [[flag of Ulster|flag of the Ulster province]]. [[Ulster loyalism|Loyalists]] sometimes display the [[flag of Scotland]] as a sign of their Scottish ancestry. [[Ulster nationalism|Ulster nationalists]] use the unofficial [[List of flags used in Northern Ireland#Ulster Nation flag|'Ulster Nation flag']], although it has now been adopted as an [[Ulster Scots people|Ulster-Scots]] flag.