The International Schools Theatre Association (ISTA) is a theatre association formed by international schools from many countries around the world. Every year ISTA holds international festivals in different countries, at different times and for different age groups. These festivals are held at international schools for primary, elementary or high school students, and ensure that both students and teachers receive the best possible experience of international theatre education.

The organization also provides various resources and support on its website: www.ista.co.uk.