Nationals from Brazil, Canada, Georgia, Germany, Hong Kong, Israel, Japan, Kazakhstan, Kyrgyzstan, Macao, Malaysia, Philippines, Russia, Serbia, Singapore, Thailand, Turkey, Ukraine and USA can visist for 14 to 90 days without a visa
Everyone else needs a visa, and a 30 day visa costs $50 and up, depending on your passport.
Mongolia Visa Information
Mongolian embassies