Pistacia atlantica Desf., commonly referred to as "Betoum", is one of many plants that grows naturally in Algeria and belongs to the Anacardiaceae family. 4 Pistacia atlantica extracts are known to have many pharmacological properties including antiviral, 5 antimicrobial, 6 antitumor, 7 antihypertensive, antioxidant, 8 anti-inflammatory, 9 antihyperglycemic, 10 antihyperlipidemic, 11 anticholinesterase, 12 and cytotoxic activities. 13,14 The term "gall" in relation to trees refers to abnormal growths or swellings that develop on the leaves, stems, branches, and even roots of trees. 15 These galls are often caused by the tree's response to the action of certain organisms, such as insects, mites, fungi, or bacteria. The organisms induce the tree to form these structures as a protective response or as part of their life cycle. 16 Galls are also used in the Sahara (Algeria) as an expectorant, against asthma and chest diseases. 13 The marginal red galls formed in the leaves of P. atlantica were, induced by Forda riccobonii insects. 17 P. atlantica has been used as an antidiabetic drug plant in Jordanian folk medicine. 18 The antihyperglycemic and antioxidant activities of marginal galls extracts formed on the leaves of P. atlantica (from Algeria), have not yet determined. Based on the ethnobotanical use of the plant galls, our study focuses on the hypoglycemic activity of crude extracts of different organic solvents, of the galls formed on P. atlantica leaves, by in vitro inhibition of alpha-amylase activity, followed by an in silico study (ligand-protein interaction) of compounds previously isolated from P. atlantica. The total phenolic, total flavonoid content, and antioxidant activity were also reported.