Oil wrestling (Turkish: yağlı güreş) is the Turkish national sport. It is known sometimes as grease wrestling because the wrestlers douse themselves with olive oil. It is related to Uzbek kurash, Tuvan khuresh and to Tatar köräş. The wrestlers, known as pehlivan (from Persian پهلوان or pehlevān, meaning "hero" or "champion") wear a type of hand-stitched lederhosen called kisbet (sometimes kispet), which were traditionally made of water buffalo hide, but now also of calfskin.
Unlike Olympic wrestling, oil wrestling matches may be won by achieving an effective hold of the kisbet. Thus, the pehlivan aims to control his opponent by putting his arm through the latter's kisbet. To win by this move is called paça kazık. Originally, matches had no set duration and could go on for one or two days, until one man was able to establish superiority, but in 1975 the duration was capped at 40 minutes for the baspehlivan and 30 minutes for the pehlivan category. If no winner is determined, another 15 minutes—10 minutes for the pehlivan category—of wrestling ensues, wherein scores are kept to determine the victor.
The annual Kırkpınar tournament, held in Edirne in Turkish Thrace since 1362, is the oldest continuously running, sanctioned sporting competition in the world. In recent years this style of wrestling has also become popular in other countries, most notably the Netherlands and Japan.

Usage of oil in wrestling dates back to 2650 BC in Egypt and Assyria. Techniques and rules of Turkish style wrestling begun taking form in Central Asia in early Middle Ages; this style of wrestling is still widely practiced among Central Asian Turkic people under names of Köraş, Khuresh, Kurash etc. Turkish wrestlers had started covering themselves according to the Islamic law (between the navel and the knees) after the 10th century.

After Oghuz branch of Turks migrated to Western Asia and Anatolia, they brought their Central Asian Kurash wrestling style with them. After conquest of Anatolia by Seljuk Turks, they brought their traditional freestyle wrestling called "karakucak" (literally means black hug)and the special leather clothing and initiated usage of olive oil, to make it harder to grap the opponent, from the ancient Western Asian wrestling; and created what is today known as the Yağlı Güreş or Turkish Oil Wrestling.
In the Ottoman Empire, wrestlers learned the art in special schools called تکیه tekke, which were not merely athletic centres, but also spiritual centres, similar to those attended by the Japanese Sumo wrestlers, where it was taught that man is not just matter, but also spirit. These centers bear a striking resemblance to the Zurkhanes of Iran. This could explain the abundance of Persian terms in oil wrestling. Since competition without the harmony of matter and spirit would be detrimental to the development of good character, wrestlers oil one another prior to matches as a demonstration of balance and mutual respect. Equally, if a younger man should defeat an older man, he kisses the latter's hand (A sign of respect for elders in Turkey, similar to a Japanese bow).
Matches are held all over Turkey throughout the year, but in early summer the wrestlers gather in Kırkpınar for the annual three-day wrestling tournament to determine who will be the baspehlivan (meaning "chief wrestler", and similar to "yokozuna" in sumo wrestling) of Turkey. Every year, around 1000 wrestlers attend the tournament. Ottoman chroniclers and writers attest that the Kırkpınar Games have been held every year since 1362, making them the world's oldest continually sanctioned sporting competition. Only about 70 times were the Games cancelled. The matches have been held there since 1924, where they were moved after the Balkan War. The original site had been some 35 kilometres distant.
Kırkpınar, on the outskirts of Edirne (the second capital of the Ottoman Empire until the fall of Constantinople in 1453), was once the site of the summer hunting palace of the Ottoman Sultan.