HAŠK (full name Hrvatski akademski športski klub, English: Croatian Academic Sports Club) was a Croatian football club established in Zagreb in 1903 which ceased operating in 1945. The club was one of the most successful sides in Zagreb and the Kingdom of Yugoslavia in the period between the two World Wars. Since then several sports clubs have claimed to descend from it, the most significant of which is HAŠK Mladost sports society.

HŠK Građanski, also known as 1. HŠK Građanski or fully Prvi hrvatski građanski športski klub, was a Croatian football club established in Zagreb in 1911 and dissolved in 1945. The club had a huge influence on the development of football in Croatia and Kingdom of Yugoslavia and achieved its greatest success in the period between the two World Wars.