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The late nineteenth and early twentieth centuries saw a vigorous but unsuccessful campaign for Irish home rule, followed by the eclipse of moderate nationalism by militant separatism. In 1922, following the Anglo-Irish War, the twenty-six counties of Ireland seceded from the United Kingdom as the Irish Free State. The remaining six, in the north-east, remained within the Union as Northern Ireland. Secession for southern Ireland led directly to the Civil War, as militant nationalists split into two factions and turned against one another.

A significant recent change to pub culture in Ireland has been the introduction of a smoking ban, in all workplaces, which includes pubs and restaurants. The ban was introduced on 29 March 2004. A majority of the population support the ban, including a significant percentage of smokers. Nevertheless, the atmosphere in pubs has changed greatly as a result, regardless of whether it has boosted or lowered sales, or whether it is a "good thing" or a "bad thing".

From its creation in 1921 until 1972 Northern Ireland enjoyed limited self-government within the United Kingdom, with its own parliament and prime minister. However the Protestant and Catholic communities in Northern Ireland each voted almost entirely along sectarian lines, meaning that the government of Northern Ireland was dominated by the Unionist majority which did not permit Catholics to participate in the government.

There are many references to food and drink in early Irish literature. Honey seems to have been widely eaten and used in the making of mead. The old stories also contain many references to banquets, although these may well be greatly exaggerated and provide little insight to every diet. There are also many references to fulacht fiadh. These were sites for cooking deer, and consisted of holes in the ground which were filled with water. The meat was placed in the water and cooked by the introduction of hot stones. Many fulacht fiadh sites have been identified across the island of Ireland, and some of them appear to have been in use up to the 17th century.

Ireland is well supplied with museums and art galleries and offers, especially during the summer months, a wide range of cultural events. These range from arts festivals to farming events. The most popular of these are the annual Dublin Saint Patrick's Day Festival which attracts on average 500,000 people and the National Ploughing Championships with an attendance in the region of 400,000. There are also a number of Summer Schools on topics from traditional music to literature and the arts.

In a number of areas, the island operates officially as a single entity, for example, in sport. The major religions, the Roman Catholic Church, the Church of Ireland and the Presbyterian Church of Ireland, are organised on an all-island basis. 92% of the population of the Republic of Ireland are Roman Catholic, and 40% in Northern Ireland. Some trades unions are also organised on an all-Irish basis and associated with the Irish Congress of Trades Unions (ICTU) in Dublin, while others in Northern Ireland are affiliated with the Trades Union Congress (TUC) in the United Kingdom. The island also has a shared culture across the divide in many other ways. Traditional Irish music, for example, though showing some variance in all geographical areas, is broadly speaking the same on both sides of the border. Irish and Scottish traditional music are similar.

Chinese and Urdu are also spoken by Northern Ireland's Asian communities. According to the most recent census returns, Chinese is now the second most widely spoken language, though the 8000-strong Chinese community — while often referred to as the "third largest" community in Northern Ireland — is tiny by international standards.

A majority of the present-day population are unionist and wish to remain part of the United Kingdom, but a significant minority, known as nationalists, want to see a united Ireland. These two views are linked to deeper cultural divisions. Unionists are predominantly Protestant and often descendants of Scottish and English (mainly Scottish) settlement in previous centuries, while nationalists are predominantly Catholic and usually descend from the Irish population predating such settlement. The conflict between these two sets of identities, including alleged discrimination against nationalists under the Stormont government (1920–72) giving rise to the nationalist "Civil Rights Movement" in the 1960s, and eventually to a long-running conflict known as The Troubles.

The culture of the people living on the island of Ireland is far from monolithic. Many notable cultural divides exist between the rural people and city dwellers, between the Catholic and Protestant people of Northern Ireland, between the Irish-speaking people within and without the Gaeltacht regions and the English-speaking majority population, between the settled people and the Travellers, and, increasingly, between new immigrants and the native population.

The Constitution of Ireland guarantees the rights of the family and the institution of marriage. However, the reality is that social and economic change in recent years has brought about significant changes in family life in the Republic. According to figures published in September, 2004, 31% of all births in the Republic of Ireland occur outside marriage. This compares with 5% in 1980. The average of mothers having their first child was 30 and the fertility is an average of 1.98 children.