Canadians do not need a visa to travel to countries within the Schengen area for stays of up to 90 days in any 180-day period. If you leave the Schengen area and return within the same 180-day period, the previous stay will count against the permitted 90 days.
Starting in 2024, U.S. passport holders traveling to Europe will need to apply for authorization through the European Travel Information and Authorization System (ETIAS) before their visit. While U.S. nationals currently enjoy visa-free access to most E.U.