The Center for Immigration Studies (CIS) is a non-profit, non-partisan think tank based in Washington, D.C. Founded in 1985, CIS focuses on research and policy analysis regarding the economic, social, demographic, and fiscal impacts of immigration in the United States. The organization aims to promote lower immigration levels while advocating for a welcoming approach to those who are admitted.

CIS produces a variety of research reports, policy analyses, and data-driven studies that examine immigration's effects on the U.S. It provides expert testimony before Congress and other governmental bodies and engages in public advocacy and policy development. The organization targets policymakers, legislators, and the general public, aiming to influence public opinion and political discourse on immigration issues.