Karşıyaka Spor Kulübü (English: Karşıyaka Sports Club), commonly referred to as Karşıyaka is a sports club located in İzmir. They are currently playing in the Turkish 1.League football. The "SK" refers to the sports club, as this club has several other sports branches on-going - basketball (which won the Turkish championship title in 1987, won the President Cup same year by beating Beşiktaş and made it to the finals two other times), volleyball, handball, tennis, swimming, sailing (twice under-21 world champions), billiards, bowling, and motorcycling.

Karşıyaka S.K. was founded on November 1, 1912 in Karşıyaka. Karşıyaka merged with Bornovaspor and was renamed as Yamanlarspor between 1937 and 1944.

On May 16, 1981, a 2nd league match between Karşıyaka and Göztepe SK which is the club's main rival, had 80,000 spectators.

Karşıyaka finished in the First League as 6th and qualified for promotion play-offs in the 2008-2009 season. They played with Boluspor on May 15, 2009 and beat them 3–2 after a penalty shootout. However, they were not promoted to the Super League after losing the final match 2–1 match after extra time to Kasımpaşa on May 17, 2009.

Karşıyaka (pronounced [kaɾʃɯˈjaka]) is a district of İzmir Province in Turkey. It is part of the Greater Metropolitan Area of İzmir, in other words a metropolitan district, the second largest after Konak in terms of population, and it is almost entirely urbanized at the rate of 99,9 per cent, with corresponding high levels of development in terms of lifestyle and services. Karşıyaka extends for twelve kilometers along the northern and eastern coastline of the tip of the Gulf of İzmir. Its center is at a distance of 20 km (12 mi) to the north from the traditional center of entire İzmir, that is Konak Square in Konak at the opposite coast, and İzmir's central areas are of quicker and easier access from Karşıyaka by ferry, in fifteen minutes to half an hour to various quays located along the Gulf's southern coastline, rather than by land by going round the gulf's outlying coastline. Karşıyaka's district area neighbors the district areas of Menemen to the north, Bornova to the east and Çiğli to the west, the last two also being among İzmir's metropolitan districts. Karşıyaka's overall level of education is recognized as being of the highest in Turkey and besides being an active venue of commerce, culturl and educational actitivies and tourism, Karşıyaka also boasts of an advanced urban culture of its own, centered around the cherished home team Karşıyaka SK, which commands a large and passionate fan base.