ɪslˈɑːm ɪz ðə pɹɪdˈɑːmɪnənt ɹᵻlˈɪdʒən ɪn ældʒˈɪɹiə, wɪð ɪts ɐdhˈɪɹənts, mˈoʊstli sˈʌniz, ɐkˈaʊntɪŋ fɔːɹ nˈaɪnti nˈaɪn pɚsˈɛnt ʌvðə pˌɑːpjʊlˈeɪʃən ɐkˈoːɹdɪŋ tʊ ɐ tˈuː θˈaʊzənd twˈɛnti wˈʌn sˌiːˌaɪˈeɪ wˈɜːld fˈæktbʊk ˈɛstᵻmət, ænd nˈaɪnti sˈɛvən.nˈaɪn pɚsˈɛnt ɐkˈoːɹdɪŋ tə pjˈuː ɹᵻsˈɜːtʃ ɪn tˈuː θˈaʊzənd twˈɛnti.
Islam is the predominant religion in Algeria, with its adherents, mostly Sunnis, accounting for 99% of the population according to a 2021 CIA World Factbook estimate, and 97.9% according to Pew Research in 2020.