Eligible countries for the Mongolia eVisa system under Mongolia include a selected list of nationalities approved for online visa processing. Travelers from countries such as India, the United States, the United Kingdom, Australia, Japan, South Korea, and several European nations may apply, depending on current immigration rules. Eligibility can vary based on visa type, such as tourism, business, or transit purposes. Applicants must ensure their passport is valid and issued by an eligible country listed on the official eVisa portal. Since eligibility rules can change, it is important to verify updated country lists before applying for the Mongolia eVisa to avoid rejection or delays.