word | | Country name |
| Hoi | Vietnam | conventional long form: Socialist Republic of Vietnam conventional short form: Vietnam local long form: Cong Hoa Xa Hoi Chu Nghia Viet Nam local short form: Viet Nam abbreviation: SRV |
| Holy | Holy See (Vatican City) | conventional long form: The Holy See (State of the Vatican City) conventional short form: Holy See (Vatican City) local long form: Santa Sede (Stato della Citta del Vaticano) local short form: Santa ... |
| Honduras | Belize | conventional long form: none conventional short form: Belize former: British Honduras |
| Honduras | Honduras | conventional long form: Republic of Honduras conventional short form: Honduras local long form: Republica de Honduras local short form: Honduras |
| Hong | Hong Kong | conventional long form: Hong Kong Special Administrative Region conventional short form: Hong Kong official long form: Xianggang Tebie Xingzhengqu official short form: Xianggang abbreviation: HK |
| Howland | United States Pacific Island Wildlife Refuges | conventional long form: none conventional short form: Baker Island; Howland Island; Jarvis Island; Johnston Atoll; Kingman Reef; Midway Islands; Palmyra Atoll |
| Hrvatska | Croatia | conventional long form: Republic of Croatia conventional short form: Croatia local long form: Republika Hrvatska local short form: Hrvatska former: People's Republic of Croatia, Socialist Republic of Croatia |
| Hungary | Hungary | conventional long form: none conventional short form: Hungary local long form: none local short form: Magyarorszag |
| I.O.M | Isle of Man | conventional long form: none conventional short form: Isle of Man abbreviation: I.O.M. |
| Iceland | Iceland | conventional long form: Republic of Iceland conventional short form: Iceland local long form: Lydveldid Island local short form: Island |
| Ilankai | Sri Lanka | ... Socialist Republic of Sri Lanka conventional short form: Sri Lanka local long form: Shri Lamka Prajatantrika Samajaya di Janarajaya/Ilankai Jananayaka Choshalichak Kutiyarachu local short form: Shri Lamka/Ilankai former: Serendib, Ceylon |