Federation (disambiguation)
Federation generally refers to two governments:

In-universe
 "Federation", a colloquial name for the United Federation of Planets
 First Federation, a government located near the Federation
 Federation (government), a type of government

Real world
 Federation (novel), novel by Judith & Garfield Reeves-Stevens
 Star Trek: Federation, an undeveloped pitch for a show
 The Federation, FASA RPG reference book

it:Federazione (disambiguazione)