ISSHINRYU is a style of karate that was (officially) founded by Tatsuo Shimabuku in 1956. The style is a combonation of the better aspects of Shorinryu and Gojoryu karate, as well as okinawan kubodo.

One of the distinctive aspects of the style is the use of a vertical fist, much like is seen in kung fu styles, but is unique in the fact that the thumb is on the top of the fist pressing down on the forefinger, rather then resting on the side. This strengthens the wrist and reduces the risk of a boxer's fracture.

Isshinryu uses strong natural stances, usually at shoulder width apart, rather than very wide locked-in stances like other systems. All kicks fall below the waist with the groin and knees as the primary targets. Punches are mainly aimed at the solar plexus to deliver a blow that knocks the wind out of the opponent.

Due to its simple logical nature Isshinruy is not the prettiest style of karate, but it is arguably one of the most practical when applied to a street fighting situation.