Greece contains 10.7 million people according to the 2021 census, with 98 percent identifying ethnically as Greek. The population density reaches 81.96 people per square kilometer across the country's 131,957 square kilometers, though settlement concentrates heavily in Athens, which holds 3.15 million residents in its metropolitan area, and Thessaloniki, with 1.03 million. The demographic structure skews older than the European Union average, with a median age of 45.3 years in 2021 and 22.3 percent of the population above 65. Fertility rates dropped to 1.39 children per woman in 2020, among the lowest in Europe. Net emigration characterized the 2010s, with approximately 427,000 Greeks leaving between 2008 and 2016 during economic crisis, though this reversed slightly after 2018.
The Greek language forms the sole official language and belongs to the Hellenic branch of Indo-European languages, representing an unbroken written tradition spanning 34 centuries. Modern Greek evolved from Koine Greek, the lingua franca of the Hellenistic world from the 4th century BCE through the Byzantine Empire. A diglossia existed from Greek independence in 1830 until 1976 between Katharevousa, an archaizing written form, and Dimotiki, the vernacular. The government formally adopted Dimotiki as the official standard in 1976 under Law 309/1976, ending the "language question" that had divided Greek society. Today 99.5 percent of residents speak Greek as their first language. Regional dialects persist, including Pontic Greek spoken by approximately 200,000 descendants of Black Sea Greeks, Cappadocian Greek with fewer than 1,000 speakers, and Tsakonian, a divergent dialect spoken in the eastern Peloponnese by roughly 2,000 people that descends from Doric rather than Koine Greek. Minority languages include Turkish spoken by the Muslim minority in Thrace, estimated at 100,000 speakers, and Arvanitika, an Albanian dialect with perhaps 50,000 speakers concentrated in Attica and the Peloponnese, though usage declines sharply among younger generations.
The Greek Orthodox Church claims 90 percent of the population according to a 2017 Pew Research Center study, though regular church attendance runs significantly lower, with a 2018 survey finding only 17 percent attend services monthly or more frequently. The Constitution establishes Eastern Orthodox Christianity as the "prevailing religion" while guaranteeing religious freedom. The Church of Greece, which includes all dioceses except those in Crete, the Dodecanese, and the Ionian Islands that remain under the Ecumenical Patriarchate of Constantinople, gained autocephaly in 1850. The state pays salaries for Orthodox clergy under agreements dating to the 19th century, though a 2018 law began transferring Church properties to state ownership while maintaining Church use. Muslims constitute 2 percent of the population, predominantly ethnic Turks and Pomaks in Thrace whose status was protected under the 1923 Treaty of Lausanne, which exempted them from the population exchange that moved 1.2 million Greeks from Turkey and 400,000 Muslims from Greece. The Muslim community receives state funding for three muftis in Thrace under the treaty provisions. Roman Catholics number approximately 50,000, concentrated in the Cyclades and Ionian Islands from Venetian and Genoese rule. Athens contains roughly 20,000 Jews, a remnant of communities destroyed in the Holocaust, which killed 87 percent of Greek Jews, reducing their number from 77,000 in 1940 to fewer than 10,000 in 1945. Thessaloniki, once called "the Mother of Israel" with a Jewish majority until the 1920s, lost 96 percent of its 46,000 Jews to Auschwitz in 1943.
Greek identity crystallized through 400 years of Ottoman rule from 1453 to 1821, during which the Ecumenical Patriarchate served as the administrative head of the Orthodox millet system, binding religion to ethnic consciousness. The Filiki Eteria, a secret organization founded in Odessa in 1814, organized the uprising that began on March 25, 1821. The War of Independence lasted until 1829, establishing a small kingdom in the Peloponnese, Central Greece, and the Cyclades under the 1830 London Protocol. The Great Idea (Megali Idea), articulated by politician Ioannis Kolettis in 1844, drove territorial expansion to unite Greek-speaking populations, achieved through the Ionian Islands' cession by Britain in 1864, Thessaly's annexation in 1881, Macedonia and Epirus gained in the Balkan Wars of 1912-1913, Western Thrace acquired in 1919, and the Dodecanese transferred from Italy in 1947. The 1919-1922 Greek-Turkish War ended in catastrophic defeat, with the 1923 Treaty of Lausanne forcing a population exchange that brought 1.2 million ethnic Greeks from Anatolia, increasing the country's population by 25 percent and creating a refugee crisis that dominated interwar politics. These Anatolian Greeks (Mikrasiates) formed distinct communities, settling primarily in Athens, Piraeus, and Thessaloniki, and developed a separate musical tradition, the "Asia Minor" style, characterized by instruments like the oud and scales borrowed from Ottoman music.
The Metaxas dictatorship from 1936 to 1941 imposed a vision of the "Third Hellenic Civilization" linking ancient Greece, Byzantium, and the modern state while suppressing communists and ethnic minorities. World War II occupation by Germany, Italy, and Bulgaria from 1941 to 1944 killed approximately 300,000 Greeks through famine, with the winter of 1941-42 seeing mass starvation in Athens. The Greek Civil War from 1946 to 1949 between government forces backed by the United Kingdom and United States and the Democratic Army of Greece supported by Yugoslavia, Albania, and Bulgaria killed 158,000 and created 700,000 internal refugees. The communist defeat in 1949 established Greece firmly in the Western bloc. Military dictatorship from April 21, 1967 to July 24, 1974 under Colonel Georgios Papadopoulos suspended constitutional rights, exiled opponents, and collapsed after the regime supported a coup against Cypriot President Makarios that triggered Turkish invasion of Cyprus on July 20, 1974. Democracy restored under Constantine Karamanlis, Greece joined the European Economic Community on January 1, 1981, becoming the tenth member state, and adopted the euro on January 1, 2001 as a founding member of the eurozone.
The debt crisis beginning in 2009 contracted the economy by 26 percent between 2008 and 2016, drove unemployment to 27.8 percent in 2013, and triggered three international bailouts totaling 288.7 billion euros between 2010 and 2015. Youth unemployment reached 58 percent in 2013. GDP per capita fell from $31,700 in 2008 to $21,800 in 2016 in purchasing power parity terms. The crisis sparked mass emigration, with 427,000 Greeks leaving between 2008 and 2016, predominantly young university graduates moving to Germany, the United Kingdom, and Australia. Austerity measures imposed by the Troika—the European Commission, European Central Bank, and International Monetary Fund—cut pensions by an average of 40 percent, reduced the minimum wage by 22 percent, and eliminated 180,000 public sector jobs. The refugee crisis beginning in 2015 saw more than one million migrants transit Greece from Turkey, with 856,000 arriving in 2015 alone, predominantly Syrians, Afghans, and Iraqis. By 2020, approximately 100,000 asylum seekers remained in Greece, with 40,000 on the Aegean islands in camps designed for 6,200, particularly on Lesvos, Chios, and Samos.
Family structure traditionally centered on extended patrilineal households, though nuclear families now predominate, with the 2011 census recording an average household size of 2.58 persons, down from 3.4 in 1981. Marriage rates declined from 6.5 per 1,000 population in 2000 to 4.3 in 2019. Civil marriage became legal in 1982 under Law 1250, ending the Church's monopoly, though religious ceremonies still account for 70 percent of marriages. Divorce rates rose from 0.7 per 1,000 population in 1980 to 1.0 in 2019, among Europe's lowest. Births outside marriage increased from 3.9 percent in 1990 to 11.4 percent in 2019, still below the EU average of 42.6 percent. Women gained suffrage in 1952. The dowry system persisted legally until 1983 when Law 1329 abolished it, though informal wealth transfers at marriage continue. Name days, the feast day of one's patron saint, traditionally hold more significance than birthdays, with widespread celebration and open-house hospitality.
Greek cuisine distinguishes itself through olive oil rather than butter, with per capita consumption of 12.1 kilograms annually, the world's highest. The Mediterranean diet pyramid codified by researchers in the 1990s derived from studies in Crete, where a seven-country study begun in 1958 found the lowest rates of heart disease despite fat constituting 40 percent of calories, attributed to olive oil's monounsaturated fats. Feta cheese, produced from sheep's milk or sheep-goat milk mixtures, gained Protected Designation of Origin status from the European Union in 2002 after a five-year legal battle with Denmark and Germany. Greek yogurt, strained to remove whey, contains twice the protein of regular yogurt. Moussaka layers eggplant, ground meat, and béchamel sauce, though its modern form dates only to the 1920s when chef Nikolaos Tselementes published a recipe adapting French techniques. Souvlaki, grilled meat skewers eaten in pita with garnishes, generates debate between Athens-style (pork) and Thessaloniki-style (with tomato and onion). Ouzo, the anise-flavored aperitif distilled from grape must, must contain at least 37.5 percent alcohol and turn milky white when water is added through the louche effect. Retsina, wine flavored with pine resin, preserves a practice from antiquity when resin sealed amphorae.
Coffee culture centers on the kafeneion, the coffeehouse where traditionally men gathered for hours of conversation, backgammon, and cards. Greek coffee, finely ground beans boiled in a briki pot, arrived with Ottoman rule and generates three distinct styles: sketos (unsweetened), metrios (medium sweet), and glykos (sweet), ordered and prepared together rather than sweetened after. The frappé, instant coffee shaken with ice water, was invented accidentally in Thessaloniki in 1957 at the International Trade Fair when Nescafé representative Dimitris Vakondios lacked hot water and used a shaker instead. By the 1980s, frappé dominated Greek coffee consumption among younger generations. Freddo espresso and freddo cappuccino, created in Athens in the 1990s, now rival traditional hot coffee even in winter.
Easter, calculated by the Orthodox calendar, exceeds Christmas in importance, with Holy Week observances including epitaphios processions on Good Friday evening when decorated biers representing Christ's tomb process through streets, and the midnight Anastasi service ending the Lenten fast. Red-dyed eggs and tsoureki brioche mark the feast. On Clean Monday (Kathara Deftera), the first day of Lent, tradition requires outdoor picnics eating only vegan foods like lagana flatbread and flying kites. August 15, the Dormition of the Theotokos, sees virtually the entire country on holiday, with villages holding panigiri festivals featuring live music, dancing, and communal feasting. Name days eclipse birthdays, with celebrants traditionally keeping open house for visitors who arrive unannounced for sweets and wishes.
The panigiri, a saint's feast day celebration, structures village social life, with each settlement celebrating its patron saint annually. These festivals feature traditional music played on instruments including the bouzouki, a long-necked lute, the lyra, a three-stringed bowed instrument dominant in Crete, and the clarinet in Epirus. Regional dance traditions divide into distinct styles: the kalamatianos, a twelve-step line dance originating in Kalamata, serves as an informal national dance, while the tsamiko from Epirus features athletic male solos, and the hasapiko, originally a butchers' guild dance, exists in slow and fast versions. The sirtaki, popularly associated with Greece through the 1964 film "Zorba the Greek," was choreographed specifically for that film by Giorgos Provias and is not a traditional dance.
Rembetika music, developing in urban working-class neighborhoods of Piraeus and Thessaloniki in the 1920s and 1930s among refugees from Asia Minor, chronicled underworld life, hashish use, and poverty through lyrics often in criminal slang. The Metaxas dictatorship banned rembetika in 1936, though it persisted underground. The genre gained intellectual respectability in the 1960s through composer Manos Hadjidakis, who defended it in a 1949 lecture, and singer Sotiria Bellou. Rebetiko instruments included the bouzouki, baglamas (a smaller bouzouki), and guitar. The genre split between the Piraeus style, featuring bouzouki and darker themes, and the Smyrna style from the Asia Minor refugees, incorporating Ottoman instruments like the oud.
The shadow puppet theater Karagiozis, introduced during Ottoman rule, features a poor hunchbacked protagonist who outwits wealthy and powerful figures through cunning. Performances traditionally occurred at festivals and name days, with the puppeteer voicing all characters behind a backlit screen. The repertoire included historical dramas about Alexander the Great and the 1821 revolution alongside comic domestic scenes. The form declined after television's arrival in 1966 but saw revival in the 1980s through state cultural programs.
Greek mountain villages traditionally practiced transhumance, with shepherds moving flocks to high pastures in summer and lowlands in winter. The Sarakatsani, a nomadic shepherd group speaking a northern Greek dialect, followed this pattern until the 1960s, living in conical reed huts during migrations. Vlachs, Romance-speaking pastoral nomads numbering perhaps 50,000 today, concentrated in the Pindus Mountains and practiced similar transhumance while maintaining a separate ethnic identity and speaking Aromanian, a language related to Romanian. Both groups largely sedentarized after World War II as roads, compulsory education, and mechanization disrupted traditional patterns.
The coffee cup reading (tasseography), inherited from Ottoman tradition, interprets patterns left by coffee grounds in the cup's bottom. After drinking, the cup is inverted on its saucer, allowed to cool, then examined for symbols. The practice remains common across age groups, typically performed informally among friends. The matiasma, belief in the evil eye cast by envious glances, persists widely, with blue glass eye charms worn for protection. Xiasimo, a ritual performed by elder women to remove the eye's curse, involves prayers, signs of the cross, and yawning as the supposed sign of its departure. These practices coexist with Orthodox Christianity without apparent contradiction.
Diaspora communities formed through successive waves of emigration beginning in the late 19th century. The Greek community in the United States numbers approximately 1.3 million claiming Greek ancestry according to the 2019 American Community Survey, with concentrations in New York (particularly Astoria, Queens), Chicago, and Boston. Tarpon Springs, Florida, developed as a sponge-diving center attracting Greeks from the Dodecanese beginning in 1905. Melbourne, Australia, contains between 300,000 and 400,000 Greek-Australians, making it the third-largest Greek-speaking city globally after Athens and Thessaloniki. Migration to Australia peaked in the 1950s and 1960s when assisted passage schemes attracted workers. Germany hosts approximately 400,000 Greeks, many arriving as Gastarbeiter from 1960 to 1973, with a second wave during the 2010s debt crisis.
The Asia Minor Catastrophe (Mikrasiatiki Katastrophi) refers to the 1922 defeat and forced population exchange, memorialized annually. The arriving refugees faced hostility from established populations competing for scarce resources during economic crisis. Refugee neighborhoods in Athens like Nea Ionia and in Thessaloniki like Kalamaria developed distinct identities. These communities preserved Asia Minor musical traditions, cuisine including dishes like soutzoukakia (spiced meatballs in tomato sauce), and dialects. By the 1950s, integration progressed as refugees' children married into established families, though refugee identity persisted. The Pontian Greeks from the Black Sea coast maintained stronger separate identity, with their own dialect, dances like the Serra, and folk music traditions.