This is a listing of lists of country codes:
- List of ISO country codes (ISO 3166)
- ITU country code (International Telecommunication Union)
- List of country calling codes E.164
- Mobile country code E.212
- Maritime identification digits
- List of ITU letter codes (radiocommunication division)
- UIC country code (International Union of Railways)
- List of GS1 country codes
- List of NATO country codes
- List of IOC country codes (International Olympic Committee)
- List of FIFA country codes (International Federation of Association Football)
- List of FIPS country codes
- List of vehicle registration codes