HAŠK was founded as a multi-sports club in November 1903 by nine Zagreb students who are today seen as pioneers of organized sports at the University of Zagreb. The club's purpose was to popularize sports among Croatian students, as well as to counter the ongoing magyarization of Croatian public life, since Croatia was at the time part of the Austro-Hungarian Empire. The club's colours were red, white and golden, chosen to represent the colours of Croatian provinces. At first, the club had sections for fencing, ice-skating, skiing, sledding and sports shooting, but ever since football was introduced in the spring of 1904, it became the most popular and well-known department of the club. The club played its first official game on 16 October 1906 against PNIŠK Zagreb which ended in a 1–1 draw in front of 800 spectators. The club played many non-league games against local sides and against foreign opponents in the following years, such as the game against BEAC in 1909. When the first Croatian football championship was started in 1912, HAŠK were heading the table in mid-season and were later declared champions as the competition was abandoned after the winter break due to poor organization. The championship was never relaunched, and during World War I the club went on hiatus.
Revival and demise
In the period from 1918 to 1945 the club grew in popularity and membership, and in the years following the war new sections for track and field athletics, tennis, swimming, field hockey, cycling, table tennis and motorsport were formed. After experiencing a financial crisis in the 1920s and a fire that destroyed stands on their ground in the summer of 1936, the following decade saw immediate revival and the time of HAŠK's greatest success. The first success came in 1923 when they won the first edition of the Yugoslav Cup, named back then as the King Alexander Cup. The club will regularly compete in the Yugoslav First League since 1927, and their finest hour came in the 1937–38 season when they won the Yugoslav title. They even went on to compete in the 1938 Mitropa Cup, when they were knocked out in the first round of the tournament by the Czechoslovakian side SK Kladno with 5:2 on aggregate. On a local level, in the period from 1911 to 1945 the club played a total of 120 matches against city rivals Građanski. Their last game was a 2–2 draw on 10 April 1945, just before both clubs were disbanded by the communist government. The newly formed Dinamo Zagreb, which was established by the authorities two months later, took over HAŠK's Maksimir ground, along with many players who switched from Građanski or HAŠK to Dinamo. Other sports sections of the club were renamed FD Akademičar and later merged with ASD Mladost which survives today as the HAŠK Mladostsports society, most famous for their later water polo and volleyball success on both the national and continental levels. The most prominent of HAŠK's football players who later joined Dinamo was Zlatko Čajkovski, who spent the next 11 seasons playing for Zagreb's powerhouse. Dinamo's current youth academy and training ground located next to their stadium both bear the name Hitrec-Kacian, in honour of two HAŠK players, Ico Hitrec and Ratko Kacian.
Post-Yugoslavia
After the fall of communism and in the midst of the breakup of Yugoslavia, the club was reactivated and officially registered in November 1990, but in name only – no sports activities were started as the new club leadership centered their activities on promoting HAŠK's legacy and organizing events intended to raise the public awareness of the contribution HAŠK has made to the development of sports in Croatia. In an attempt to revive their glory days, the newly restarted club decided to enter competition sports again in 1993 so they merged with a local amateur football side called NK TPK from the Peščenica neighbourhood of Zagreb. In 2006 they merged again with the Druga HNL side NK Naftaš Ivanić from Ivanić Grad to form the present dayNK HAŠK, currently a second tier club in the Croatian football league system. They play their games at the Donje Svetice ground in Zagreb, which has a capacity of 3,000.
