The Committee on Foreign Investment in the United States (CFIUS, commonly pronounced "Cifius" ) is an inter-agency committee of the United States Government that reviews the national security implications of foreign investments in U.S. companies or operations. Chaired by the United States Secretary of the Treasury, CFIUS includes representatives from 16 U.S. departments and agencies, including the Defense, State and Commerce departments, as well as (most recently) the Department of Homeland Security.

CFIUS was first established by President Gerald Ford's Executive Order 11858 in 1975, initially to study foreign investment. But in the 1980s, fear of Japanese investment (and in particular a proposed purchase of Fairchild Semiconductor by Fujitsu) led Congress to pass the Exon–Florio Amendment in 1988, which empowered CFIUS to reject deals. From 2013 to 2015, 20% of CFIUS's cases have to do with investment from China. CFIUS does not acknowledge which deals are under review, does not require the involvement of any of the parties of a deal, and does not publicly announce its findings.