The International School of Colon Hydrotherapy (ISCH) is a training institution that provides education and certification in colon hydrotherapy. It is located at Elizabeth Street in Surry Hills, New South Wales, Australia.

Colon hydrotherapy, also known as colonic irrigation or colonic lavage, is a type of alternative therapy that involves the introduction of water into the colon through the rectum in order to cleanse the colon. It is not a medical procedure and is not recommended as a treatment for any specific medical condition. The ISCH offers courses in colon hydrotherapy for individuals who are interested in becoming colon hydrotherapy practitioners.

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