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AGU can provide an invitation letter to assist in securing a travel visa for the annual meeting. This letter can be submitted with your visa application to verify the name, dates, location, and purpose of the meeting.
A letter of invitation can only be provided to the registered participant planning to present or attend the meeting. Letters for other persons, e.g., family members, cannot be issued. Individuals requiring a letter of invitation to obtain travel visas can complete the online request form.
The invitation letter is not a commitment on the part of the organizers to provide financial support but may serve as proof of travel purpose of the visa applicant.
We recommend that international participants apply for visas three months prior to AGU25 (roughly 1 October 2025). Some consulates may have delays in scheduling visa interviews. We encourage you to first contact the consulate to determine the wait time for an interview. If you require a letter of invitation before submitting an abstract or you will not be submitting an abstract, you must request one by completing this form. After submitting an abstract, you can automatically generate a letter of invitation through the abstract submission system.
U.S. Government Requirement for Visa Waiver Program
Effective 20 January 2011, citizens of the Visa Waiver Program (VWP) countries will be unable to enter the United States without Electronic System for Travel Authorization (ESTA) approval from the U.S. Government. VWP travelers who have not obtained approval through ESTA will be denied boarding on any carrier destined for the United States.
Business Visa Center
The U.S. Department of State offers resources and information to assist foreign nationals traveling to the U.S. for temporary business.
Visit the Business Visa Center
Visa Waiver Program
Review the requirements to participate in the Visa Waiver Program, which allows citizens meeting specific requirements to enter the U.S. for 90-days without a visa.
Learn more about the Visa Waiver Program
U.S. Department of State
Comprehensive information about traveling to the United States, and the policies and procedures for obtaining a visa.
Learn more about obtaining a VISA