Nogometni Klub Istra 1961 (English: Istra 1961 Football Club), commonly referred to as NK Istra 1961 or simply Istra 1961, is a football club from Pula, Croatia, currently playing in the Croatian First Division.
The football club NK Uljanik from which the club originates was founded in 1948. In 1961, it joined with another local club, NK Pula, to form NK Istra. For this reason, 1961 is occasionally considered as the club's founding year. The greatest club success was in the 2002–03 season when they finished runners-up in the Croatian Cup, losing to Hajduk Split 4–1 on aggregate. In the 2004–05 season, the club changed its name into NK Pula 1856, because the year 1856 was the year that the Austro-Hungarian Empire made Pula the port of its arsenal and the shipyard Uljanik was opened. Also in the same year, in competed in the Prva Liga for the first time. In 2005, it was renamed again to NK Pula Staro Češko due to a sponsorship contract with the brewery Daruvarska pivovara (Staro Češko is a beer brand). Just one year later, the name was once again changed, this time to NK Pula. Again, just a year later in summer 2007, the name was changed for the fifth time in as many years, to NK Istra 1961. The change of name came after an ultimatum from the local fans Demons who said the club would have their support only if the club changed its name and club colours to the traditional city colours (yellow and green).
Istra 1961 play their home matches at the recently renovated Stadion Aldo Drosina, which has a capacity of approximately 10,000 spectators.
Nk Istra 1961  was bought by an American Investment group in 2015, who led the team throughout the 2015-2016 season, and continues to lead the team into the 2017 season. The NK Istra academy system is very strong and consistently competes for top spots in the rankings. Nk Istra 1961 has a rich fan history. The group of die hard fans are referred to as the Demoni, and are known for their explosive chants and celebrations as well as their extreme pride for the club.