For the 27 countries in the Visa Waiver Program, citizens meeting the visa waiver criteria will not need a visa, but they must have a machine-readable passport. Please refer to http://www.travel.state.gov/visa/tempvisitors_novisa_waiver.html for more information on these requirements. Canadian citizens do not need a visa, but should visit: http://www.travel.state.gov/visa/temp/without/without_1260.html for more information. The U.S. Embassy Consular Section will decide, per immigration law, about a particular applicant's eligibility for a given visa type based on the information and documentation presented to the consular officer. However, we can provide this information for you. Except for Canadians and those who can travel on the visa waiver program, anyone who wants to attend a business, educational, professional, or amateur sports event, conference or meeting who is not a government official, will generally need a visitor visa (B1/B2). Media and journalists, including citizens from visa waiver program countries, will generally need an "I" or media visa. Government officials traveling for official purposes would need an "A" visa. Please refer to the Department of State website for Visa Wait Times for visa appointments at http://www.travel.state.gov/visa/tempvisitors_wait.php. Advance planning by foreign travelers is critical. We recommend all foreign travelers consider the following when making their plans to travel to the United States:

Some applicants will need additional screening and will be notified when they apply. We recommend contacting the Consular Section via the Internet at: http://travel.state.gov/visa/questions_embassy.html. For a few countries, foreign travelers will need to contact the Consular Section by telephone. If a visa is needed, foreign travelers should apply for his/her visa as soon as possible, but no later than 60 days before the travel date. If the conference is scientific in nature, or the applicant has a scientific background, the visa application should be made no later than 90 days in advance of the travel. Applicants should apply to the U.S. Embassy Consular Section in his/her country of residence.

Under immigration law, the applicant will need to overcome the presumption that he/she is an intending immigrant. This is done by establishing, to the consular officer's satisfaction, that he/she is not going to stay in the U.S. based on strong compelling ties to his/her home country. The applicant must establish that he/she plans to come to the U.S. for a definite temporary period and that he/she has access to sufficient funds to cover the entire trip. Such documents, such as letters of invitation, though not required in the instructions for the visa application, would be for presentation to the consular officer during the visa interview. The letter of invitation can provide information about the conference or meeting by explaining the purpose and specific plans of the intended travel, including an explanation of any funding provided for the applicant. This letter cannot guarantee the issuance of a visa. Applicants for nonimmigrant visas must show that they qualify individually on their own merit per provisions of the Immigration and Nationality Act. Applicants must demonstrate that they are properly classifiable as non-immigrants under U.S. law and not on the basis of an American sponsor's assurance.

The Department of State recommends our web site as the first source of up-to-date visitor visa information. Information about visitor visas, what a person needs to apply and fees is available on our web site at: http://travel.state.gov.