Hungarians and Roma are the principal minorities, with a declining German population and smaller numbers of Serbs, Croats, Ukrainians, Greeks, Turks, Armenians, Great Russians, and others. Minority populations are greatest in Transylvania and the Banat, areas in the north and west, which belonged to the Austro-Hungarian Empire until World War I. Even before union with Romania, ethnic Romanians comprised the overall majority in Transylvania. However, ethnic Hungarians and Germans were the dominant urban population until relatively recently, and ethnic Hungarians still are the majority in a few districts.

Before World War II, minorities represented more than 28% of the total population. During the war that percentage was halved, largely by the loss of the border areas of Bessarabia and northern Bukovina (to the former Soviet Union -- now Moldova and a portion of south-west Ukraine) and southern Dobrudja (to Bulgaria), as well as by the postwar flight or deportation of ethnic Germans. In the last several decades, more than two-thirds of the remaining ethnic Germans in Romania emigrated to Germany.

Romanian troops during World War II participated in the destruction of the Jewish communities of Bessarabia and Transnistria (both now comprising the independent Republic of Moldova) and Bukovina (now part of Ukraine). Although subjected to harsh persecution, including government-sanctioned pogroms and killings, most Jews from the territory now comprising Romania survived the Holocaust. Mass emigration, mostly to Israel, has reduced the surviving Jewish community from over 300,000 to less than 10,000.

Religious affiliation tends to follow ethnic lines, with most ethnic Romanians identifying with the Romanian Orthodox Church. Also ethnically Romanian is the Greek Catholic or Uniate church, reunified with the Orthodox Church by fiat in 1948, and restored after the 1989 revolution. The 2002 census indicates that less than 1% of the population is Greek Catholic, as opposed to about 10% prior to 1948. Roman Catholics, largely ethnic Hungarians and Germans, constitute about 5% of the population; Calvinists, Baptists, Pentecostals, and Lutherans make up another 5%. There are smaller numbers of Unitarians, Muslims, and other religions.

Romania's rich cultural traditions have been nourished by many sources, some of which predate the Roman occupation. The traditional folk arts, including dance, music, wood-carving, ceramics, weaving and embroidery of costumes and household decorations still flourish in many parts of the country. Despite strong Austrian, German, and especially French influence, many of Romania's great artists, such as the painter Nicolae Grigorescu, the poet Mihai Eminescu, the composer George Enescu, and the sculptor Constantin Brancusi, drew their inspiration from Romanian folk traditions.

The country's many Orthodox monasteries, as well as the Transylvanian Catholic and Evangelical Churches, some of which date back to the 13th century, are repositories of artistic treasures. The famous painted monasteries of Bukovina make an important contribution to European architecture.

Poetry and the theater play an important role in contemporary Romanian life. Classic Romanian plays, such as those of Ion Luca Caragiale, as well as works by modern or avant-garde Romanian and international playwrights, find sophisticated and enthusiastic audiences in the many theaters of the capital and of the smaller cities.