Northern Ireland has no officially designated flag since the 1972 suspension of its devolved parliament. The Union Flag (Union Jack)—the UK's national flag—serves as the de facto official flag for government buildings, international representation, and most formal contexts.
Ulster Banner (1953–1972): Red cross of St. George on white field, defaced with six-pointed star, Red Hand of Ulster, and imperial crown. Used by the Stormont government. Still appears in unionist communities and some sports (Commonwealth Games).
St. Patrick's Saltire: Red saltire on white—represents Ireland in the Union Jack since 1801. Historically linked to the Order of Saint Patrick (British order, 1783).
Unionist/loyalist areas: Union Jack, Ulster Banner, Scottish/English flags.
Nationalist/republican areas: Irish tricolor (Republic of Ireland flag).
Official/government: Union Jack only.
Sports: Varies by governing body—Commonwealth Games uses Ulster Banner; FIFA/UEFA use "Northern Ireland" banner; rugby uses IRFU flag (four provinces).
The 1998 Good Friday Agreement deferred flag resolution. The 2013 Haass-O'Sullivan talks failed to reach consensus. No neutral symbol commands cross-community acceptance.