NK Opatija is a Croatian association football club founded in 1911 and based in Opatija. They compete in Druga HNL, the second tier of the Croatian football league system.
History
The club was founded in 1911 and had an early rivalry with the German-organised team in Opatija, Vorwarts.
Opatija won the 2013–14 Treca HNL West group, but instead of promotion to the second division, they decided to play in the fourth division the next season due to not meeting the licensing requirements.
Opatija famously took Dinamo Zagreb to extra time in the 1/8th round of the 2014–15 Croatian Cup, losing 4–2 after a controversial penalty was awarded to Dinamo.
The club has been looking into reconstructing their stadium to allow them to play in the 2. HNL. Currently, the stadium's pitch dimensions are only 100x64 meters, which do not meet the requirements for the second division. However, the newly proposed stadium would only have dimensions of 90x60 meters, only good enough for the fifth division. The new stadium is currently planned to be built in 2021.