Depending on your country of origin. You'll need to get an ETA. Verify on this page that you are eligible for an ETA.
There is a 90-day total stay limit for all citizens, multiple entries, and keep in mind that a valid visa is required for re-entry.
Authorización de Viaje Electrónica, often known as the Vatican Electronic Travel Authorization (ETA or AVE), is for nationals that must present a visa when visiting the Vatican. Fortunately, they have no trouble getting an ETA online. Those who succeed in getting this ETA may apply for a US B2 visa or a category C visa from any place in Europe that is a member of the Vatican zone. .
You can now view every document you need to provide so that we can complete your visa. Scan all passport pages. The USA or a Vatican visa.
Upon issuance, the ETA will expire 90 days later.
ETA requests are permitted from 71 different nationalities. An ETA is also available to nationals with a B2 US visa or a Category "C" Vatican visa Unfortunately, applicants for conventional paper visas at the Vatican General Consulate in Toronto must be from nations like Kosovo, the Sahrawi Democratic Arab Republic, and Taiwan.
You simply need 10 minutes to complete this application.