The politics of Croatia are defined by a parliamentary, representative democratic republic framework, where the Prime Minister of Croatia is the head of government in a multi-party system. Executive power is exercised by the Government and the President of Croatia. Legislative power is vested in the Croatian Parliament (). The Judiciary is independent of the executive and the legislature. The parliament adopted the current Constitution of Croatia on 22 December 1990 and decided to declare independence from Yugoslavia on 25 June 1991. The Constitutional Decision on the Sovereignty and Independence of the Republic of Croatia came into effect on 8 October 1991. The constitution has since been amended several times. The first modern parties in the country developed in the middle of the 19th century, and their agenda and appeal changed, reflecting major social changes, such as the breakup of Austria-Hungary, the Kingdom of Serbs, Croats and Slovenes, dictatorship and social upheavals in the kingdom, World War II, the establishment of Communist rule and the breakup of the SFR Yugoslavia.

The President of the Republic () is the head of state and the commander in chief of the Croatian Armed Forces and is directly elected to serve a five-year term. The government (), the main executive power of Croatia, is headed by the prime minister, who has four deputy prime ministers who serve also as government ministers. Twenty ministers are in charge of particular activities. The executive branch is responsible for proposing legislation and a budget, executing the laws, and guiding the foreign and internal policies. The parliament is a unicameral legislative body. The number of Sabor representatives (MPs) ranges from 100 to 160; they are elected by popular vote to serve four-year terms. The powers of the legislature include enactment and amendment of the constitution and laws; adoption of the government budget, declarations of war and peace, defining national boundaries, calling referendums and elections, appointments and relief of officers, supervising the Government of Croatia and other holders of public powers responsible to the Sabor, and granting of amnesties. The Croatian constitution and legislation provides for regular presidential and parliamentary elections, and the election of county prefects (county presidents) and assemblies, and city and municipal mayors and councils.

Croatia has a three-tiered, independent judicial system governed by the Constitution of Croatia and national legislation enacted by the Sabor. The Supreme Court () is the highest court of appeal in Croatia, while municipal and county courts are courts of general jurisdiction. There are other specialised courts in Croatia, commercial courts and the High Commercial Court, misdemeanour courts and the High Misdemeanour Court, administrative courts and the High Administrative Court. Croatian Constitutional Court () is a court that deals primarily with constitutional law. Its main authority is to rule on whether laws that are challenged are in fact unconstitutional, i.e., whether they conflict with constitutionally established rights and freedoms. The State Attorney's Office represents the state in legal proceedings.

History

Within Austria-Hungary

Events of 1848 in Europe and the Austrian Empire brought dramatic changes to Croatian society and politics, provoking the Croatian national revival that strongly influenced and significantly shaped political and social events in Croatia. At the time, the Sabor and Ban Josip Jelačić advocated the severance of ties with the Kingdom of Hungary, emphasising links to other South Slavic lands within the empire. Several prominent Croatian political figures emerged, such as Ante Starčević, Eugen Kvaternik, Franjo Rački and Josip Juraj Strossmayer. A period of neo-absolutism was followed by the Austro-Hungarian Compromise of 1867 and the Croatian–Hungarian Settlement, which granted limited independence to Croatia. This was compounded by Croatian claims of uninterrupted statehood since the early Middle Ages as a basis for a modern state. Two political parties that evolved in the 1860s and contributed significantly to the sentiment were the Party of Rights, led by Starčević and Kvaternik, and the People's Party, led by Janko Drašković, Ivan Kukuljević Sakcinski, Josip Juraj Strossmayer and Ivan Mažuranić. They were opposed by the National Constitutional Party, which was in power for most of the period between the 1860s and the 1918, and advocated closer ties between Croatia and Hungary.

Other significant parties formed in the era were the Serb People's Independent Party, which later formed the Croat-Serb Coalition with the Party of Rights and other Croat and Serb parties. The Coalition ruled Croatia between 1903 and 1918. The leaders of the Coalition were Frano Supilo and Svetozar Pribićević. The Croatian Peasant Party (HSS), established in 1904 and led by Stjepan Radić, advocated Croatian autonomy but achieved only moderate gains by 1918. In Dalmatia, the two major parties were the People's Party – a branch of the People's Party active in Croatia-Slavonia – and the Autonomist Party, advocating maintaining autonomy of Dalmatia, opposite to the People's Party demands for unification of Croatia-Slavonia and Dalmatia. The Autonomist Party, most notably led by Antonio Bajamonti, was also linked to Italian irredentism. By 1900, the Party of Rights had made considerable gains in Dalmatia. The Autonomists won the first three elections, but all elections since 1870 were won by the People's Party. In the period 1861–1918 there were seventeen elections in the Kingdom of Croatia-Slavonia and ten in the Kingdom of Dalmatia.

First and Second Yugoslavia

After the establishment of the Kingdom of Serbs, Croats and Slovenes, the HSS established itself as the most popular Croatian political party and was very popular despite efforts to ban it. The 1921 constitution defined the kingdom as a unitary state and abolished the historical administrative divisions, which effectively ended Croatian autonomy; the constitution was opposed by HSS. The political situation deteriorated further as Stjepan Radić of the HSS was assassinated in the Yugoslav Parliament in 1928, leading to the dictatorship of King Alexander in January 1929. The HSS, now led by Vladko Maček, continued to advocate the federalisation of Yugoslavia, resulting in the Cvetković–Maček Agreement of August 1939 and the autonomous Banovina of Croatia. The Yugoslav government retained control of defence, internal security, foreign affairs, trade, and transport while other matters were left to the Croatian Sabor and a crown-appointed Ban. This arrangement was soon made obsolete with the beginning of World War II, when the Independent State of Croatia, which banned all political opposition, was established. Since then, the HSS continues to operate abroad.

In the 1945 election, the Communists were unopposed because the other parties abstained. Once in power, the Communists introduced a single-party political system, in which the Communist Party of Yugoslavia was the ruling party and the Communist Party of Croatia was its branch. In 1971, the Croatian national movement, which sought greater civil rights and the decentralisation of the Yugoslav economy, culminated in the Croatian Spring, which was suppressed by the Yugoslav leadership. In January 1990, the Communist Party fragmented along national lines; the Croatian faction demanded a looser federation.

Modern Croatia

In 1989, the government of the Socialist Republic of Croatia decided to tolerate political parties in response to growing demands to allow political activities outside the Communist party. The first political party founded in Croatia since the beginning of the Communist rule was the Croatian Social Liberal Party (HSLS), established on 20 May 1989, followed by the Croatian Democratic Union on 17 June 1989. In December 1989, Ivica Račan became the head of the reformed Communist party. At the same time, the party cancelled political trials, released political prisoners and endorsed a multi-party political system. The Civil Organisations Act was formally amended to allow political parties on 11 January 1990, legalising the parties that were already founded.

By the time of the first round of the first multi-party elections, held on 22 April 1990, there were 33 registered parties. The most relevant parties and coalitions were the League of Communists of Croatia – Party of Democratic Changes (the renamed Communist party), the Croatian Democratic Union (HDZ), and the Coalition of People's Accord (KNS), which included the HSLS led by Dražen Budiša, and the HSS, which resumed operating in Croatia in December 1989. The runoff election was held on 6 May 1990. The HDZ, led by Franjo Tuđman, won ahead of the reformed Communists and the KNS. The KNS, led by Savka Dabčević-Kučar and Miko Tripalo – who had led the Croatian Spring – soon splintered into individual parties. The HDZ maintained a parliamentary majority until the 2000 parliamentary election, when it was defeated by the Social Democratic Party of Croatia (SDP), led by Račan. Franjo Gregurić, of the HDZ, was appointed prime minister to head a national unity government in July 1991 as the Croatian War of Independence escalated in intensity. His appointment lasted until August 1992. During his term, Croatia's declaration of independence from Yugoslavia took effect on 8 October 1991. The HDZ returned to power in the 2003 parliamentary election, while the SDP remained the largest opposition party.

Franjo Tuđman won the presidential elections in 1992 and 1997. During his terms, the Constitution of Croatia, adopted in 1990, provided for a semi-presidential system. After Tuđman's death in 1999, the constitution was amended and much of the presidential powers were transferred to the parliament and the government. Stjepan Mesić won two consecutive terms in 2000 and 2005 on a Croatian People's Party (HNS) ticket. Ivo Josipović, an SDP candidate, won the presidential elections in December 2009 and January 2010. Kolinda Grabar-Kitarović defeated Josipović in the January 2015 election run-off, becoming the first female president of Croatia.

In January 2020, former prime minister Zoran Milanović of the Social Democrats (SDP) won the presidential election. He defeated center-right incumbent Kolinda Grabar-Kitarovic of the ruling Croatian Democratic Union (HDZ) in the second round of the election. In July 2020, the ruling right-wing HDZ won the parliamentary election. Since 2016 ruled HDZ-led coalition of prime minister Andrej Plenković continued to govern.

Legal framework

Croatia is a unitary democratic parliamentary republic. Following the collapse of the ruling Communist League, Croatia adopted a new constitution in 1990 – which replaced the 1974 constitution adopted by the Socialist Republic of Croatia – and organised its first multi-party elections. While the 1990 constitution remains in force, it has been amended four times since its adoption—in 1997, 2000, 2001 and 2010. Croatia declared independence from Yugoslavia on 8 October 1991, which led to the breakup of Yugoslavia. Croatia's status as a country was internationally recognised by the United Nations in 1992. Under its 1990 constitution, Croatia operated a semi-presidential system until 2000 when it switched to a parliamentary system. Government powers in Croatia are divided into legislative, executive and judiciary powers. The legal system of Croatia is civil law and, along with the institutional framework, is strongly influenced by the legal heritage of Austria-Hungary. By the time EU accession negotiations were completed on 30 June 2010, Croatian legislation was fully harmonised with the Community acquis. Croatia became a member state of the European Union on 1 July 2013.

Executive