| Requirements for U.S. citizens to enter Bulgaria on Business: A letter of invitation from Bulgarian host. A business letter of financial responsibility   typewritten on the company letterhead, and addressed to: Embassy of Bulgaria Visa   Section, Washington D.C. The letter must explain the purpose of travel and duties   to be performed in Bulgaria and guarantee financial support for the applicant   while in Bulgaria. 
                                                           Business Travel  
                                                                
                                                                  U.S. Passport must be Valid 3 months Beyond Intended Stay
                                                                   Tickets and Documents for Return or Onward Travel
                                                                   No Visa Required for Stay up to 30 days
                                                                   Vaccinations - None Required
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