In 1995, The College for International Studies and Endicott College entered into an affiliation agreement whereby CIS students who are enrolled in Endicott College academic programs receive Endicott College Credit, which can be transferred to any US college or university.

CIS is authorized by the Community of Madrid as a foreign university in Spain (BOCM number 81, April 6th, 1998, and BOCM number 134, June, 7th, 2019).

Endicott College (Massachusetts, USA) is accredited by the New England Comission on Higher Education (NECHE).