Israel
conventional long form: State of Israel
conventional short form: Israel
local long form: Medinat Yisra'el
local short form: Yisra'el

Italy
conventional long form: Italian Republic
conventional short form: Italy
local long form: Repubblica Italiana
local short form: Italia
former: Kingdom of Italy

Jamaica
conventional long form: none
conventional short form: Jamaica

Jan Mayen
conventional long form: none
conventional short form: Jan Mayen

Japan
conventional long form: none
conventional short form: Japan
local long form: Nihon-koku/Nippon-koku
local short form: Nihon/Nippon

Jarvis Island
conventional long form: none
conventional short form: Jarvis Island

Jersey
conventional long form: Bailiwick of Jersey
conventional short form: Jersey

Johnston Atoll
conventional long form: none
conventional short form: Johnston Atoll

Jordan
conventional long form: Hashemite Kingdom of Jordan
conventional short form: Jordan
local long form: Al Mamlakah al Urduniyah al Hashimiyah
local short form: Al Urdun
former: Transjordan

Juan de Nova Island conventional long form: none conventional short form: Juan de Nova Island local long form: none local short form: Ile Juan de Nova