ABSTRACT. Let E be an elliptic defined over a number field K. Then its Mordell-Weil group E(K) is finitely generated:In this paper, we discuss the cyclic torsion subgroup of elliptic curves over cubic number fields. For N = 169, 143, 91, 65, 77 or 55, we show that Z/N Z is not a subgroup of E(K) tor for any elliptic curve E over a cubic number field K.