Except for those not subject to this formality, foreigners wishing to travel to Algeria must previously obtain a visa from Algerian diplomatic or consular posts.
Foreigners can obtain diplomatic, service, courtesy, press, tourist, business, study, work, temporary work, family, medical, cultural, and transit visas.
Visa application forms can be downloaded from the websites of Algerian diplomatic or consular posts. They must be completed and accompanied by a passport, valid for at least six months, and some documents, such as: passport’s photocopy, recent identity photos, identical identity documents, travel insurance and an invitation letter. It is necessary to check, from Algerian diplomatic or consular post of the applicant’s usual place of residence, all required documents at the time of application. They must be submitted to the Algerian diplomatic or consular post of the applicant's usual place of residence.
You find more information regarding visa requirements at the following website: https://www.mfa.gov.dz/services-for-foreigners/entry-visa-to-algeria