Fenerbahçe SK, a major Turkish multi-sport club based in Istanbul, Turkey, have developed a strong following since their foundation in 1907. They are the second most popular football club in Turkey, with 35% of Turkey supporting them,^[1] and the most popular in Istanbul and Ankara.^[1] Fenerbahçe have a large fanbase throughout in Turkey, Northern Cyprus,^[2][3] Azerbaijan,^[4] South Korea^[5][6] and in the Turkish diaspora.^[7][8] There are also fans from other Muslim communities in the world, as well as minorities in Turkey such as Circassians and Kurds.^[9] The supporters are known for their passionate, fierce, and unwavering support. In their home at the Şükrü Saracoğlu Stadium, Fenerbahçe's average attendances have been among the highest in Turkey.^[10][11]

Many fanzines, blogs, podcasts, forums and fan websites have been dedicated to the club and the fans have long-standing rivalries with several other clubs; the most notable of these is with neighbours Galatasaray with whom they regularly contest the Intercontinental derby, and Beşiktaş, with whom they regularly contest the Beşiktaş-Fenerbahçe derby with.

The supporters of Fenerbahçe SK are well known for their passionate, fierce, and unwavering support. The supporters' motto is "Hep Destek Tam Destek", abbreviated as "HDTD" (English: "Always Support, Full Support", Spanish: "Te Apoyo Siempre, Te Apoyo Entodo").

An 2000s survey found that Fenerbahçe supporters only see the Istanbul giants as their rivals and most dislike Galatasaray, followed by Trabzonspor and Beşiktaş, although all of Galatasaray, Beşiktaş, and Trabzonspor fans see Fenerbahçe as their main rival, mostly due to Fenerbahçe by itself dominating Turkish football for many years in the past.

Fenerbahçe has had friendly relations with clubs from different countries, due to many reasons. Some include: in Turkey, Kırklarelispor, Menemenspor, Eskişehir Demirspor, Ankara Demirspor, Eskişehirspor and many more; in Brazil, Coritiba; in Serbia, Novi Pazar; in Norway: Lillestrøm, in Greece; AEK^[14][15] and; in England, Sheffield United; in the Netherlands, Feyenoord; in Germany: Bayern Munich. In addition to this, Fenerbahçe, Beşiktaş and Galatasaray were officially brother clubs in the 1910s, due to the fact that their common goal was to defeat non-Muslim teams. This, however, is no longer the case.

In November 2011, Fenerbahçe's GFB created a friendly relationship with Serbian club FK Novi Pazar's supporter group Torcida Sandžak. During a Turkish Super League match against İstanbul Büyükşehir Belediyespor at the Şükrü Saracoğlu Stadium, the GFB and 1907 Gençlik stands deployed a giant banner reading "Kalbimiz Seninle Novi Pazar" ("Novi Pazar, Our Hearts Are With You").^[16] Eventually, in the match against Radnički Kragujevac in the Serbian SuperLiga, Torcida Sandžak members deployed a banner reading "Sancak'ta atıyor, Fenerbahçe'nin kalbi" ("The heart of Fenerbahçe beats in Sandžak").^[17]

On March 2, 2012, Fenerbahçe's GFB and 1907 Gençlik group members were invited to Novi Pazar for the match against Partizan in the Serbian SuperLiga. Thousands of Torcida Sandžak members welcomed GFB and 1907 Gençlik's 17 members.^[18]

There is an informal friendship and fraternization between the fans of AEK and Fenerbahçe. In the 2017 Euroleague final, Fenerbahçe S.K. supporters displayed a banner which read "Same City's Sons"^[14][15]

Notorious Fenerbahce hooligans in 1987. They shot a with gun Beşiktaş youth football player, Mehmet Ozkan, and a Beşiktaş supporter, but both survived. Fenerbahce Hooligans attacking those who came to the match attacked the police station where Beşiktaş fans were hiding.^[19]

On 13 December 1993, a Fenerbahçe fan was beaten to death by Beşiktaş fans in a cafe after celebrating the Fenerbahçe victory.^[20]

In the 1995–96 season, Fenerbahçe were the unmatched dominating force in football while Galatasaray were considered a smaller team. When Galatasaray reached the cup final against Fenerbahçe, Fenerbahçe were expected to win easily, however Galatasaray beat Fenerbahçe in the first leg by a Dean Saunders penalty. Their manager Graeme Souness took a giant Galatasaray flag after the match and planted it in the centre of the pitch and insulted Fenerbahçe and its supporters in order to provoke and anger the Fenerbahçe fans.^[21]

In 1996, after a derby match, 1 Galatasaray supporters were stabbed to death by a Fenerbahçe stand leader, known as Esenlerli Sebo.^[22][23][24]

In 2006 Galatasaray supporters opened a racist banner which targeted Mehmet Aurélio, player of Fenerbahçe and the Turkey national team with Brazilian roots.^[25] The Fenerbahçe supporters protested which resulted in them getting attacked by Galatasaray fans.^[25]

In 2012, a Galatasaray supporter named Ugur Fakili was stabbed to death by a Fenerbahçe fan with whom he had an argument before the match.^[26][27]

On 13 May 2013, a Fenerbahçe fan was stabbed multiple times to death after the Intercontinental Derby. After the match, which resulted in a 2–1 victory for Fenerbahçe, the 19 year old Fenerbahçe fan was on his way home after the match when he and his companions were attacked by Galatasaray fans.^{[28][29][30][20]}

On 27 July 2022, during the UEFA Champions League qualifier game against Dynamo Kiev, there were chants supporting Vladimir Putin by a small number of Fenerbahçe fans. The Fenerbahçe's president said that the club will not apologise for the chants. The game played during the 2022 Russian invasion of Ukraine.^[31]

Fenerbahçe supporters do not have good relations with police forces around the country and especially the General Directorate of Security.^[32][33] This is because of their general opposition to the Erdogan government.

Below is a list of people who are known as Fenerbahçe SK supporters: