Do I need a passport or visa to enter?
A valid passport, visa, and proof of onward/return ticket are required. The Bissau-Guinean Embassy in Washington, DC, suspended operations in January 2007. The Embassy of Guinea-Bissau does not have a website. Due to Guinea-Bissau’s lack of consular representation in the United States, it can be difficult for you to obtain the required visa for entry into Guinea-Bissau. Since most flights destined for Guinea-Bissau must pass through Dakar, Senegal, or Lisbon, Portugal, most travelers are able to apply for visas at the Bissau-Guinean embassies in those countries. Although it is possible to obtain a visa upon arrival in Bissau if arrangements are made in advance, there are no clear instructions for how to make those arrangements.
Guinea-Bissau remains an unstable threat environment for which additional security precautions are required. The U.S. State Department rates Guinea-Bissau as a high threat country for political violence and crime. All official U.S. government travelers (including personnel assigned to the U.S. Embassy in Dakar), must have Regional Security Office (RSO) approval and are required to receive an RSO country-specific security briefing prior to travel.