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In this study, the chemical composition of the essential oils (EOs) obtained from different aerial parts (flowers, leaves, and stems) of <i>Seseli bocconei</i> Guss., a wild species endemic of Sicily, was investigated. Furthermore, the EOs’ biocidal effects towards two pests of stored products, <i>Sitophilus oryzae</i> and <i>Callosobruchus maculates</i>, were evaluated. This activity was evaluated in Petri dish bioassays to establish the survival rate of adults treated with the EOs comparing them with solvent and a commonly used insecticide (pyrethrum). The data obtained from the toxicity bioassay evidenced that stems’ EOs and leaves’ EOs have a contact/fumigation effect towards the two insect species tested, while the EOs from the flowers did not exhibit a different mortality than the solvent. The EOs from the stem and leaves of <i>S. bocconei</i>, tested at 10 mg/petri dish, determined a LT50 of 53.38 and 42.97 h, respectively, on <i>S. oryzae</i> adults, and of 45.23 and 42.97 h, respectively, on <i>C. maculatus</i> adults. The promising bioactivity of <i>S. bocconei</i> leaves’ EOs and stems’ EOs toward <i>S. oryzae</i> and <i>C. maculatus</i> is encouraging in the perspective to test these oils and their main constituents for further experiments in the laboratory and field.