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- Iceland
- Ifni
- India
- Indo-China
- Indo-Chinese Post Offices in China
- Indonesia
- Indore (Holkar State)
- Inhambane
- Inini
- Ionian Islands
- Iran
- Iraq
- Ireland
- Isle Of Man
- Italian Colonies
- Italian East Africa
- Italian Occupation of Cephalonia and Ithaca
- Italian Occupation of Corfu and Paxos
- Italian Occupation of Corfu
- Italian Occupation of Ionian Islands
- Italian Post Offices in China
- Italian Post Offices in Crete
- Italian Post Offices in the Turkish Empire
- Italy
- Ivory Coast
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