Knattspyrnufélagið Víkingur, commonly referred to as Víkingur or Víkingur Reykjavík and internationally known as Vikingur F.C., is an Icelandic sports club based in the Fossvogur neighbourhood of Reykjavík. It is one of the oldest sports clubs in Iceland, founded on the 21st of April 1908.
The football club has won five Championship titles, five First Division titles and two Cup titles. Víkingur operates other sports divisions including handball, tennis, table tennis, karate and skiing. All sports include both male and female teams.