A faunistic study on beetles was conducted in two areas of the Gharb Plain (Mamora forest and Merja of fouarat) to improve knowledge of their local diversity, assess species and provide the first list of heritage species, using the various techniques used in the field of entomology among which (hunting by sight, Barber Pots, sweeping on vegetation). The beetles were caught from mid-August to the end of October 2016. A total of 17 species have been identified. The inventory conducted consists of 17 species belonging mainly to the families of: Scarabaeidae, Cerambycidae, Buprestidae, Carabidae, Dynastidae, Coccinellidae, Tenebrionidae, Platypodidae. At the Mamora forest, we have identified 17 species belonging to 8 families, the majority of which are represented by Scarabaeidae with 47.05%, followed by Cerambycidae, Buprestidae, with 11.76%, Carabidae, Dynastidae, Coccinellidae, Tenebrionidae, Platypodidae are represented by 5.88% for each. At the Merja of fouarat, we have inventoried 13 species of Coleoptera distributed over 6 families. The Scarabaeidae family is the richest with a rate of 47.05% of all inventoried species, the other families, Cerambycidae, Carabidae, Dynastidae, Coccinellidae, Tenebrionidae, are represented by an equal rate or 5.88%.