IK Sirius Fotbollsklubb, commonly known as IK Sirius FK or Sirius Fotboll, is a Swedish football club based in Uppsala. Founded in 1907, the club is part of the wider IK Sirius sports association, which has a long history in Swedish sport. The football section is one of the recognised sporting organisations in Uppsala and represents the city in Swedish professional football. The club's senior men's team competes in the Allsvenskan, the highest level of Swedish men's football, and has played in the competition continuously since its promotion in 2016. Its home matches are played at Studenternas, a centrally located stadium in Uppsala with a capacity of approximately 10,000 spectators. The club's traditional colours are blue and black, giving rise to its nickname, Blåsvart. IK Sirius has developed from a local sports association into a professional football organisation with senior-team operations, youth development and community programmes. Its academy and youth structure provide football opportunities for young players and support their development through organised training and competition. The club also operates commercial and administrative functions, including sponsorship, ticketing, communications, matchday operations and partnerships with local businesses. Through initiatives such as Gränslös Fotboll, Sirius works with the local community and business partners to create inclusive environments and opportunities for children and young people. The organisation has established itself in Sweden's top division and continues to develop its sporting and community activities. Its official website provides club news, fixtures, match results, squad information, ticketing details, academy updates and other announcements. The football club is based at Sportfältsvägen 3 in Uppsala, while its senior team uses Studenternas as its home stadium. IK Sirius FK is distinct from the wider IK Sirius multi-sport association, although it shares the association's historical identity and roots. With its long history, distinctive blue-and-black colours, professional football presence and strong connection to Uppsala, Sirius Fotboll remains an important part of the city's sporting landscape.