The International Organization for Crystal Growth (IOCG) is a federation of national groups and societies which represent national communities of scientists active in the area of crystal growth. The general purposes of IOCG are scientific, literary and educational, directed toward the advancement of the theory and practice of crystal growth, crystal characterization and allied branches of science. Means to these ends include the holding of the triennial Intern. Conference on Crystal Growth and Epitaxy (ICCGE) jointly with the Intern. Summer School on Crystal Growth (ISSCG) as well as the support to further topical meetings on crystal growth.​​​​​

​​​