Countries That Start With O

1 country has a name starting with O. The list draws on the 193 UN member states plus Vatican City. A leading “The” is not counted as the first letter.

• Asia (1)

Asia

• Oman

  Western AsiaAsia

Sources

• Which countries are listed, the region under each name, and the UN M49 names: United Nations Statistics Division, Standard country or area codes for statistical use (M49).
• Other names: Natural Earth, Admin 0 – Countries (1:10m), attribute table (names only) and Wikidata, English labels of the country items.

Checked September 29, 2026. How this list is put together.