The history of Jews in Algeria goes back to Antiquity, although it is not possible to trace with any certainty the time and circumstances of the arrival of the first Jews in what is now Algeria. In any case, several waves of immigration helped to increase the population. There may have been Jews in Carthage and present-day Algeria before the Roman conquest, but the development of Jewish communities is linked to the Roman presence. Jewish revolts in Israel and Cyrenaica in the 1st and 2nd centuries certainly led to the arrival of Jewish immigrants from these regions. The vast majority of scholarly sources reject the notion that there were any large-scale conversions of Berbers to Judaism.

Sephardic Jews, also known as Sephardi Jews or Sephardim, and rarely as Iberian Peninsular Jews, are a Jewish diaspora population associated with the Iberian Peninsula. The term, which is derived from the Hebrew Sepharad, can also refer to the Jews of the Middle East and North Africa, who were also heavily influenced by Sephardic law and customs. Many Iberian Jewish exiled families also later sought refuge in those Jewish communities, resulting in ethnic and cultural integration with those communities over the span of many centuries.