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Portugal is a member state of the European Union and a member of the Schengen Area.


See Visitportugal, the official website for Portugal as a tourist destination

Citizens of the European Union, Andorra, Iceland, Liechtenstein, Norway and Switzerland only need their identity document to enter Portugal. Minors, in addition to their identity document, must present parental authorisation to travel.
For countries that are exempt from visa requirements to enter the Schengen Area (see list), for stays that do not exceed 90 days, a passport valid for a period of more than three months after the end of the stay is required.

In accordance with the Convention implementing the Schengen Agreement, passengers travelling to or from another Schengen State do not need a new visa as this is considered to be an internal flight.

Citizens from other States need a visa to enter Portugal, which may be requested from the Portuguese Consulate or Embassy in the respective country, for stays of up to 90 days.

Further information at:
Visas -
Consular Network -
SEF - Immigration and Borders Service - 



If you need a visa, we recommend applying for a Schengen Visa at the Portugese Embassy or Consulate in your country at least two months before the intended travel date to Portugal.


If you need an official invitation in order to attend the Conference , you may request it by filling this letter with your personal data: name the file by your family name and send it to by Friday, June 30, 2023. Invitation letters with modified invitation text will not be accepted.

Please include also a copy of your valid passport and your CV motivating your request by explaining your interest in the conference.

If you are a paper presenter or a workshop/tutorial speaker, please mention it in your cover letter. 

Your personal data will be taken directly from the letter you filled; no changes or corrections can be made by the Organising Committee. If your invitation letter contains incorrect data, you have to send the letter again.

The invitation letter will be sent to you by email with an attached pdf file. Invitations will NOT be sent BY FAX neither to you nor to the relevant embassy. If you would like to receive a hard copy of the invitation letter via courier/shipping agent, please contact a courier service by your own means.


The processing time takes up to 10 working days and CANNOT by shortened. Please check your spam folder before contacting us for undelivered invitations.

Please note that the invitation letter will only be sent to delegates who have already paid their registration fee.

In case of visa refusal, the amount paid for registration is refundable, except for an administrative fee of EUR 50.

Invitation Letter for VISA purpose

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