Swiss Confederation

A Confederacy of Dunces, a novel written by John Kennedy Toole, published in 1980

Canadian Confederation

Iroquois Confederacy, a group of united Native-American nations in both Canada and the United States of America

Confederate States of America, eleven southern states of the United States of America between 1861 and 1865. "Confederate" may also be used in reference to the CSA's military:

Federation, a union comprising a number of partially self-governing states or regions united by a central government

Powhatan Confederacy

Confederacy of Independent Systems, an organization in the Star Wars movies.

Confederation, an association of sovereign states or communities

Confederate Ireland

Peru-Bolivian Confederation of 1836–1839

Federacy, where one or several substate units enjoys considerably more independence than the majority of the substate units

Confederate States Army

Confederate States Navy

Three Confederate States of Gojoseon of Korean pseudohistory

Galactic Confederacy, a part of Scientology's belief system

Confederate States Marine Corps

Terran Confederation, a fictional political entity in the Wing Commander universe

Confederate Motor Company, an American manufacturer of motorcycles

Terran Confederacy, a fictional political entity in the StarCraft universe