Kyeok Sul Do (Hangul: 격술도), also often romanized as Gjogsul, is a martial art created in the Democratic People's Republic of Korea (i.e. North Korea) that is practised primarily by personnel of the Korean People's Army and its intelligence agencies.

Kyeok Sul Do was also taught to the armies of Eastern European states that were part of the former Warsaw Pact.

Kyeok Sul Do bears no historical or organizational relationship to the South Korean martial art Kuk Sul Do, despite their similar names.

Etymologically, it is a combination of the roots kyeok—"strike/blow", sul—"art", then do—"way". The martial art of Kyeoksuldo originated from taekkyon and the older Subak martial system that emerged in 420. The martial art proper was developed around 1926, within the resistance group led by Kim Il-Sung to fight against the Japanese.

During the Korean War, Kyeok Sul Do was taught to communist partisans in order to fight off against the more muscular, larger caucasian American and European soldiers. Further development of Kyeok Sul Do took place with the start of the conflict with South Korea. During the Cold War, North Korea enlisted foreign martial artists to train their troops. General Choi Hong Hi, one of the founding fathers of Taekwondo, was one of such people, when he brought Taekwondo to North Korea in 1979.

According to defector An Myeong-jin, the trainees hit each other's bodies with thick ropes and exercised striking by hitting on concrete and/or a haystack, with reportedly some trainees dying from these exercises.

In the 1980s, there was a North Korean Movie called Order No. 027 that lead to influx of young North Koreans becoming interested in Kyeok Sul Do.

There are martial arts competitions in North Korea built around Kyeok Sul Do. According to historical records referred by Mookas martial arts magazine, "the earlier contests were about the same as boxing, but in 1987's 7th contest, it evolved to the level of kickboxing."