Siniša Hajdaš Dončić

Siniša Hajdaš Dončić (né Hajdaš; born 29 June 1974) is a Croatian politician serving as president of the center-left Social Democratic Party (SDP), and as leader of the opposition since September 2024.

He previously served as minister of maritime affairs, transport and infrastructure from 2012 to 2016 in the Cabinet of Zoran Milanović. Before that, he served as Prefect of the Krapina-Zagorje County in northern Croatia from 2009 to 2012.

Early life and education Hajdaš Dončić was born in the small town of Zabok, Yugoslavia, in modern-day Croatia, on 29 June 1974. He graduated from the Faculty of Economics and Business at the University of Zagreb in 1999. He finished postgraduate studies in 2002, and defended his doctoral dissertation at the University of Split in 2012.

Career Hajdaš Dončić has been a lecturer at the Professional Business School of Higher Education LIBERTAS and at the college for business and management Baltazar Adam Krčelić in Zagreb since 2002.

From 2002 until 2006, he was head of the department for economy, agriculture and tourism in Krapina-Zagorje County. From 2006 to 2009, he was the director of the Zagorje Development Agency (Croatian: Zagorska razvojna agencija). He would also become member of the Croatian Parliament in 2011, a position he holds to this day.

In September 2024, he became president of the SDP, succeeding Peđa Grbin as Leader of the Opposition.

Minister of Maritime Affairs, Transport and Infrastructure (2012–2016) Hajdaš-Dončić was the second transport minister in the Milanović government, succeeding Zlatko Komadina. Komadina resigned three months after taking office, citing health problems. After being sworn in on 18 April 2012, Hajdaš Dončić said that his mandate “will be imbued with determination, transparency and the introduction of order in all departments covered by the Ministry of Maritime Affairs, Transport and Infrastructure”.

Roadways In December 2012, Hajdaš Dončić was at the opening of the Vrgorac – Karamatići section of the A1 highway and the Metković interchange – border with Bosnia and Herzegovina section of the A10 highway. Construction started under the previous government, during Božidar Kalmeta’s mandate. The opening took place alongside a small protest from the residents of nearby villages.

Highways monetisation In 2013, the national highways operator Croatian Highways was €3.2 billion in debt. In order to ease financial pressures, Hajdaš Dončić proposed monetising national highways by giving concessions to foreign companies and investors. The move sparked a public backlash, and the opposition demanded Hajdaš Dončić step down. Critics feared the investors would raise toll prices and fire workers in order to achieve profitability. A vote demanding a referendum on the monetisation, which was set up in November 2014, got 530,000 signatures from citizens dissatisfied with the government’s decision. Its organizers then handed the signatures to the Croatian Parliament, and after an inspection by the Croatian Bureau of Statistics, 460,000 signatures were confirmed as authentic by January 2015, enough to trigger a referendum. However, in April the Constitutional Court of Croatia ruled the referendum unconstitutional, citing that the government had authority to execute the plan. Nonetheless, the backlash was enough for the government abandon the project in March, which warned that Croatian Highways and Highway Rijeka-Zagreb (ARZ) would end the year with a deficit. When asked about it, Hajdaš Dončić responded with “the wiser head gives in”. Despite that, at the end, none of the plans were executed. In the three years, from 2013 to 2016, the company’s debt shrunk by €64 million to €3.136 billion. Its budget was also strained by the lowering of the fuel tax, resulting in a 50% decline in tax revenue.

Railways In September 2015, Hajdaš Dončić inspected the 10th new low floor Končar train that was bought for regional commutes.

Air In May 2014, Hajdaš Dončić and Prime Minister Zoran Milanović attended the opening ceremony of the construction of Zagreb Airport’s new passenger terminal worth €243 million. The new terminal would also include a new airstrip, parking, and new access roads. The project was made possible by a public-private partnership between the Croatian Government and Aéroports de Paris, Bouygues Construction, TAV Airports, Viadukt, Marguerite fund and IFC. In April 2012, days before Hajdaš Dončić became minister, the airport was sold to the same consortium of French and Turkish firms until 2042.

In May 2015, Dubrovnik Airport secured €148 million from the European Investment Bank with the help of the Croatian Government to construct a new passenger terminal, renovate the airstrip and construct a new administrative building. The goal was to relieve the existing terminal, which saw almost 2 million passengers in 2016, and better connect Dubrovnik with the rest of the world amid growing tourist demand. The investment was welcomed by the Mayor of Dubrovnik Andro Vlahušić. The final cost of the project reached €225 million, with the passenger terminal opening in May 2017.

In October 2015, Hajdaš Dončić announced that a new Split Airport passenger terminal would begin construction in spring 2016. The €60 million investment was meant increase the airport’s capacity to over 2 million passengers per year and bring in a new, modern look. However, construction wouldn’t start until December 2016, 11 months after Hajdaš Dončić left office.

Leader of the Opposition (2024–present) After a defeat in the 2024 parliamentary election, which saw Andrej Plenković and HDZ win a third mandate, and in the 2024 European Parliament election, Peđa Grbin admitted defeat and announced he would not seek reelection as president of the party. Voting took place on 14 September, and none of the six candidates won a majority of the vote. Siniša Hajdaš Dončić came in the closest with 48.78%, while Zoran Paunović came in second with 20.65%. A second round of voting between the two took place a week later on 21 September. After the counting ended, Hajdaš Dončić was declared winner and new president of the SDP with 56.46% of the vote, or 4,447 votes, while Paunović got 3,430 or 43.54% of the vote. The turnout was less than 40%, which the party called defeating. In his address statement, Hajdaš Dončić said that he will defend minority, women's and sexual minorities rights, as well as promote anti-facism. In the 2025 Zagreb local election, the SDP and We Can! ran on a joint ticket, and are signaling a coalition for the upcoming parliamentary election. At a party conference in January 2026, the main themes were shortening of work hours, strengthening the role of unions, and giving tax breaks to companies that increase wages. Hajdaš Dončić also called for a more progressive tax system, and urged party members to reject ultraconservatism. The HDZ responded on Facebook with a post saying that the SDP and We Can! have some of the highest local taxes in cities they control, like Zagreb and Rijeka.

In June 2025, after the local elections, the SDP fired the party's leadership in four biggest cities: Zagreb, Rijeka, Split, and Osijek. In Split, the firings for their defeat included president Davor Matijević, who left the party entirely just a month later, which he explained in a Facebook post writing "after 17 years of membership, I am resigning as Executive Secretary for Dalmatia and member of the head committee, leaving the party and giving you a chance to recover without me."

Controversy In August 2012, images surfaced of an email from Krunoslav Šamsa to Zagreb Airport employees in which he informed them he would become the new deputy director for the concession of the airport, which was government owned. The leaks sparked a backlash because the email was written in June, despite the public procurement being announced two months later on 9 August. Siniša Hajdaš Dončić, who was accused of manipulating the hiring process, confirmed the credibility of the email, but said that the public procurement was still ongoing and that nobody had been hired yet. He said that Šamsa was one of the most qualified people to lead the role, and that if someone better made an offer for the position, they would be chosen instead. Despite the comments, the public procurement was later terminated and Šamsa was not given the position.

Personal life Siniša Hajdaš Dončić is married to Martina Hajdaš Dončić since 2003, with whom he has two children. He met her, who was also an activist, at a festival in Krapina. To show his appreciation, he added her surname to his own, an unusual practice in Croatia. He was once a member of the Croatian Democratic Union, for which he said it was his father's fault and that he wasn't active.