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Let φ be a Z/2Z-spin structure on a closed oriented surface Σ g of genus g 4. We determine a generating set of the stabilizer of φ in the mapping class group of Σ g consisting of Dehn twists about an explicit collection of 2g + 1 curves on Σ g . If g = 3 then we determine a generating set of the stabilizer of an odd Z/4Z-spin structure consisting of Dehn twists about a collection of 6 curves. Résumé. -Soit φ une Z/2Z-structure de spin sur une surface fermée orientée Σ g de genre g 4. Nousdoi:10.5802/ahl.112 fatcat:z3jppji6vbconktr4mybwdhtbm