Which countries require a visa for Oman?

The list of countries whose citizens require a visa for Oman is relatively small and includes: Afghanistan, Algeria, Bangladesh, Chad, Djibouti, Eritrea, Ethiopia, Kenya (for stays of up to 30 days), Mauritania*, Nigeria (Boko Haram section)*, Pakistan (for stays of up to 30 days), Somalia*, Sudan and Yemen. (*Stays of up to one month). If