Florida State University

Fresno State University

Ferris State University

Florida State University Panama City

Fayetteville State University

Fairmont State University

Friedrich Schiller University of Jena

Frostburg State University

the Finance Sector Union, a trade union in Australia

the former Soviet Union, the nations of Russia, Estonia, Latvia, Lithuania, Belarus, Ukraine, Moldova, Georgia, Armenia, Azerbaijan, Kazakhstan, Kyrgyzstan, Uzbekistan, Turkmenistan, and Tajikistan. These countries, except Estonia, Latvia and Lithuania, now form the Commonwealth of Independent States (CIS).

Friends Stand United, a group within the Boston hardcore scene notorious for producing Boston Beatdown

A "Functional Sub Unit," in radiobiology and physiology among others