A passport is required that does not expire before the intended duration of the visit to Belgium, as well as proof of sufficient funds and a return airline ticket, are required. American citizens do not need a visa to travel to Belgium for business or pleasure for up to 90 days. That 90-day period begins with entry to any of the "Schengen group" countries: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, and Sweden. Multiple visits to Schengen countries may not exceed 90 days in any 6 month period.
