Hrvatski Športski Klub Zrinjski Mostar, usually known more simply as Zrinjski, was originally founded back in 1905, making it the oldest club in Bosnia and Herzegovina. However, the club ceased operations in 1945, after being shut down by the Yugoslavian government. The team was re-established in 1992, after Bosnia and Herzegovina gained independence. Their main rivals are FK Velež Mostar and the rivalry between the two clubs is known as the Mostar Derby.
In the first two years after the club's re-emergence in the 1990s, Zrinjski competed primarily in friendly matches, due to the ongoing Bosnian war. However, in 1994, they became a founding member of the Herzeg-Bosnia Football Federation. As a result, they joined the league system and established themselves as one of the top teams in the country.
The club have been crowned as champions of the Premier League of Bosnia and Herzegovina on two occasions, with those wins coming in 2004-05 and 2008-09. Between those two title wins, Zrinjski were also able to achieve further domestic success, by winning the 2007-08 Football Cup of Bosnia and Herzegovina, after beating FK Sloboda Tuzla in the final. As a result of their success within the country, the team have been granted entry to both the UEFA Champions League and the UEFA Europa League competitions.
Croatian international midfielder, Luka Modrić, is perhaps the club's best-known former player and he enjoyed a loan spell with the side in 2003-04. Other notable alumni include Zoran Rajović and Ivan Lendrić, who were both Premier League golden boot winners during their time at Zrinjski.
The club's home matches are played at Bijeli Brijeg Stadium, which is officially called Stadion HŠK Zrinjski. The venue was built in 1971 and had previously served as the home stadium of FK Velež Mostar. It is one of the largest stadiums in the country, with a capacity of 25,000.