To attend the SENIA Cambodia 2025 Conference, you probably need a tourist visa. Only exempt countries (see list below) do not need a visa.
In lieu of an arrival card, Cambodia has a mobile phone app. Complete it one week OR LESS prior to your arrival. If you don't have a smartphone or internet connection, you can still complete the E-arrival card using the tablets available at most airports in Cambodia.
Citizens from the following countries do not require a visa to enter Cambodia: