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Mineral composition of two walnut cultivars (Franquette and Hartley) originating both in France and California was determined. It included antioxidant trace elements: copper, zinc, and selenium. Microwave assisted mineralisation was followed by atomic absorption spectrometry for all minerals except selenium which was quantified by GC-MS, and phosphorus by a colorimetric method. Three elements presented major level differences linked to variety or origin. For origin, potassium levels of the French walnuts were higher (Franquette: 487 and Hartley: 466 mg per 100g) than those of the Californian walnuts (Franquette: 358 and Hartley: 372 mg per 100g). Inversely, sodium level was higher in the Californian Hartley than in the French Hartley (6.7 vs. 0.6 mg per 100g). For variety, high levels of magnesium were observed for the Franquette cultivars (French: 191 and Californian: 202 mg per 100g) while the Hartley levels were lower (French: 129 and Californian: 134 mg per 100g). The same observation could be made for zinc, but the differences were weaker.No statistical differences were observed for copper and selenium levels. 232