Defunct Eleftheros Kosmos (Greek: Ελεύθερος Κόσμος, Free World) is the oldest nationalist newspaper in Greece.

Eleftheros Kosmos was founded on July 27, 1966, by Savvas Konstantopoulos (1910-1981), former publisher of the daily Apogeumatini" and before that reporter and political analyst for the newspapers Neos Kosmos, Ethniki Floga, Ethniki, Ellinikon Aima, Akropolis and editor in chief of Asyrmatos.

Savvas Konstantopoulos was called "the theorist of the junta" (the military government that ruled Greece from 1967 to 1974).

Its main characteristic in this period was calls for the release of the imprisoned military junta leaders that ruled Greece between 1967 and 1974.

Eleftheros Kosmos started circulating again in 2014 off and on as a weekly or monthly until 2020, when it stopped again due to financial difficulties.