FII

FII may refer to:
 * Fabricated or induced illness, also known as Münchausen syndrome by proxy
 * Foreign Institutional Investor
 * Forestry Innovation Investment, a company publicly owned and operated by the province of British Columbia, Canada
 * Friends of Israel Initiative
 * Falling into Infinity, a 1997 studio album by progressive metal band Dream Theater
 * Fokker F.II, a commercial aircraft
 * Foxconn Industrial Internet, a Chinese electrical equipment company
 * Future Investment Initiative, an investment conference in Saudi Arabia