The American Karate System (AKS) is a style of karate, founded by Ernest Lieb in 1964. This style includes techniques of karate, jujutsu, hapkido, taekwondo, judo, aikido, kobudo and kung-fu. The current chief instructor is Michael A. Sullenger, 8th Dan.

Ernest Lieb also was the founder and original president of the American Karate Association and the first to run the prestigious AKA Grand Nationals tournament. A pioneer of American karate and a fierce competitor in the 1960's, he was the first American citizen to win the Tae Soo Do World Championships.

The American Karate System (Germany) is the only non-asian style of karate organized in the biggest German Karate Organization, known as Deutscher Karate Verband. Head of the style in Germany is Andreas Modl, 6th Dan.

In 2005, following a disagreement between the American and the German leaderships, the German AKS branch ceased to be a part of the American mother organization. Consequently, the American Karate System (USA) ceased to be a member of the Deutscher Karate Verband (DKV).