Algeria–Holy See relations
Although Islam is the state religion of Algeria, the Holy See has maintained a comparatively good relationship with the Algerian authorities, with Léon-Étienne Duval being famously recognized as the "bishop of Muslims" after the departure of French colonists.
Algeria–Iran relations
Algeria is one of the few Arab and Sunni nations that has been friendly towards Iran despite Algeria is a majority Sunni while Iran is a majority Shia Islam respectively. However, although enjoying cordial relationship, sometimes relationship between two countries had been strained, with the Algerian Civil War at 1990s, and the current situation of the Arab world towards Iran. Nonetheless, Algeria remains close and friendly tie with Iran due to its neutrality at the expense of Saudi Arabia.