While citizens of many countries world-wide usually do not require a visa to enter Switzerland, citizens of some countries do. See the official Entering Switzerland page for complete visa information, including a list of countries and territories whose citizens require visas in order to enter Switzerland as visitors.

Guest Speakers and Attendees are responsible for obtaining and paying for their own visa.

However, if you need an invitation letter in order to obtain a visa, please contact gtac-2009-logistics@google.com.