The United Federation of Planets, also known as "The Federation" is a fictional interplanetary federal republic depicted in the Star Trek television series and motion pictures. In those episodes and films, the Federation is described as an interstellar federal polity with, as of the year 2373, more than 150 member planets and thousands of colonies spread across 8,000 light years of the Milky Way Galaxy, and taking the form of a post-capitalist liberal democracy and constitutional republic. It has also been described as a utopian society. The Federation is described as stressing, at least nominally, the values of universal liberty, equality, justice, peace, and cooperation. The Federation also maintains its own quasi-militaristic and scientific exploratory agency, known as Starfleet (also written as "Star Fleet" in some texts). Starfleet is seen handling many other governmental processes, sometimes with no other agency's influence, such as border defense, diplomatic envoy and has seen extensive use as an offensive military force just to name a few instances.

Dans l'univers de fiction de Star Trek, la Fédération des planètes unies ou Fédération unie des planètes (United Federation of Planets) est l'équivalent à l'échelle galactique de notre ONU. Il s'agit en l'occurrence d'une alliance entre des peuples capables de voyager dans l'espace à vitesse de distorsion (revenant à se déplacer dans le subespace) et partageant des valeurs morales communes.

The United Federation of Planets, UFP eller "Federationen", är en fiktiv interplanetarisk stat i tv-serierna och filmerna om Star Trek. I seriernas avsnitt och i filmerna beskrivs Federationen som en interstellär federal stat med fler än 150 medlemsplaneter samt tusentals kolonier utspridda över 8000 ljusår av Vintergatan. Federationen är utformad som en liberal demokrati och konstitutionell republik. Den har även sin egen militära och utforskande gren som kallas Stjärnflottan. UFP har funnits som del av Star Trek sedan första säsongen av den första serien, The Original Series.

Zjednoczona Federacja Planet - to fikcyjna organizacja istniejąca w Star Trek. Jest to rodzaj galaktycznej unii łaczącej prawie 150 światów. Stolicą Federacji jest Ziemia.

La Federazione dei Pianeti Uniti o Federazione Unita dei Pianeti (nell'originale inglese United Federation of Planets) è un'istituzione fittizia dell'universo fantascientifico di Star Trek.