The Association of Christian Schools International (ACSI) is a Christian educational organization. Since 1978, ACSI has advanced excellence in Christian schools by enhancing the professional and personal development of Christian educators and providing support functions for Christian schools.

Through a host of services, including teacher and administrator certification, school accreditation, legal/legislative help, and curriculum publishing, the association touches the lives of more than 3.9 million students worldwide. Along with a headquarters facility, ACSI has 27 regional offices in North America and around the globe. Nearly 23,000 schools from more than 100 countries are members.