Ulster is one of the four historical provinces which make up the island of Ireland. The others are Leinster, Munster and Connacht.

There are nine counties in Ulster. Three of them are in the Republic of Ireland:

The other six counties make up all of Northern Ireland, which is part of the United Kingdom:

Because most of Ulster is in Northern Ireland, the name "Ulster" is also sometimes used to mean Northern Ireland, even though Northern Ireland is only part of Ulster. This is called totum pro parte in Latin which means "the whole for a part".

Other Languages
Afrikaans: Ulster
العربية: أولستر
aragonés: Ulaidh
asturianu: Ulster
azərbaycanca: Olster
Bân-lâm-gú: Ulster Séng
беларуская: Ольстэр
беларуская (тарашкевіца)‎: Ольстэр
български: Ълстър
bosanski: Ulster
brezhoneg: Cúige Uladh
català: Ulster
čeština: Ulster
Cymraeg: Ulster
dansk: Ulster
eesti: Ulster
Ελληνικά: Όλστερ
English: Ulster
español: Úlster
Esperanto: Ulster
euskara: Ulster
فارسی: اولستر
føroyskt: Ulster
français: Ulster
Gaeilge: Cúige Uladh
Gàidhlig: Còigeamh Uladh
galego: Ulster
한국어: 얼스터
հայերեն: Օլսթեր
hrvatski: Cúige Uladh
Bahasa Indonesia: Ulster
interlingua: Ulster
Interlingue: Ulster
Ирон: Ольстер
íslenska: Ulster
italiano: Ulster
עברית: אלסטר
ქართული: ოლსტერი
Latina: Ultonia
latviešu: Olstera
lietuvių: Alsteris
македонски: Алстер
Nederlands: Ulster
Nedersaksies: Ulster
日本語: アルスター
norsk: Ulster
norsk nynorsk: Ulster
Nouormand: Ouotonîn
occitan: Ulster
پنجابی: الستر
polski: Ulster
português: Ulster
română: Ulster
русский: Ольстер
Scots: Ulster
slovenčina: Ulster
српски / srpski: Алстер
srpskohrvatski / српскохрватски: Ulster
suomi: Ulster
svenska: Ulster
татарча/tatarça: Ольстер
Türkçe: Ulster
українська: Ольстер
اردو: السٹر
Tiếng Việt: Ulster
粵語: 烏勒省