Nogometni klub Zagreb (Zagreb Football Club), commonly known as NK Zagreb or simply Zagreb (pronounced [zâːɡreb]), is a Croatian amateur football club based in the Croatian capital city of Zagreb. It currently competes in the fourth tier league competition of Croatian football league system, Četvrta nogometna liga Središte Zagreb podskupina A in Croatian (Fourth football league Region Zagreb division A) for the third consecutive season. The club was founded in 1908 as HŠK Zagreb, meaning Hrvatski športski klub Zagreb (Croatian Athletic Club Zagreb). After World War II NK Zagreb had a considerable success in former Yugoslavia being enlisted as a notable club (at least 10 top-flight seasons or at least one title) in Yugoslav First League. Zagreb played a total of 15 seasons in the top flight before league got disintegrated in 1991 with only Croatian big teams Hajduk, Dinamo and Rijeka achieving more competitive seasons. The biggest achievement in that period happened in 1964–65 season when Zagreb finished 6th under the management of coach Gustav Lechner and contribution of an all-time club legend, prolific forward Zlatko Dračić, a league top goalscorer.
From 1992 to 2016 Zagreb played in top division of Croatian football then known as Prva hrvatska nogometna liga (Croatian First Football League), short Prva HNL or 1.HNL or simply HNL as a founding club member with the exception of 2013–14 season. The greatest accomplishment in Croatian football came in 2001–02 season. Under the guidance of manager Zlatko Kranjčar, against all odds, NK Zagreb surprisingly won the championship, with club's young striker Ivica Olić securing a title of league top goalscorer. It was the first time since its establishment in 1992 and, by some accounts, the first time in 57 years that the Croatian champion was not Dinamo Zagreb or Hajduk Split, an achievement that was repeated only once, 15 years later by HNK Rijeka. Another rarity that Zagreb achieved in the Croatian football happened in 2013–14 season when they promptly won Croatian Second Football League, thus becoming the only football club in Croatia to ever hold titles in both first and second division. Zagreb were also finalist of 1997 Croatian Football Cup and finalist of Croatian Football Super Cup in 2002.
In October 2018, after eviction from their historical home venue, Stadion u Kranjčevićevoj, NK Zagreb is using their training camp ZAGREBello with an approximate capacity of 1,000 as a home ground for its official fixtures, which is located in Veslačka street. The team's traditional home colours are white shirts, shorts and socks, which is the reason why they are referred to as Bijeli in Croatian, meaning "The Whites". Another popular nickname of the club is "The Poets", Pjesnici in Croatian, due to their former location of home ground at Kranjčevićeva street, which is named after Croatian poet Silvije Strahimir Kranjčević and became a well-known phrase "club from the street of poet", that was often used by the popular radio sports commentator Ivo Tomić for NK Zagreb when broadcasting football matches.Although NK Zagreb is currently competing in the fourth tier of Croatian Football League, it competed in the top-level First Croatian Football League for 24 seasons until 2016, when the club was relegated from first division for its second and the last time. From 2009–10 season due to non-existence of club board, poor management skills and unprofessional behavior of its president, by the end of the decade club faced three relegation drops in four seasons, loss of professional status and home ground. For long period of time, in particular from 1950s to 2010s, NK Zagreb was the second strongest and most famous football club in city of Zagreb and by far the most famous football club in Trešnjevka neighbourhood. Also, NK Zagreb participated several times in the European competitions like UEFA Champions League (2), UEFA Cup Winners' Cup (4), UEFA Intertoto Cup (10) and Inter-Cities Fairs Cup (10).