The present study on the diversity of noctuid moths (Lepidoptera-Noctuidae) carried out in three phœnicicultural sites in the Biskra region (northern Algerian Sahara) during the year 2022 - 2023, enabled us to inventory 26 noctuid moth species. They are divided into eight subfamilies, 12 tribes and 19 genera. Our results show that the El Outaya station has the highest number of species, with 25 taxa (55.25% of the total). The species Agrotis ipsilon and Agrotis segetum predominate at all study sites. Caradrina flavirena and Caradrina claripalpis come second, but these two taxa are practically absent from the Ain Benoui station. Monitoring of noctuid moth fluctuations shows that the Outaya and Sidi Okba stations have two main flight periods, the first in autumn and the second between the beginning of March and the end of April. At Sidi Okba, we observed an uninterrupted presence of moths, with intense adult activity during the autumn period.