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We investigate an open fermionic string theory in a non-commutative target phase space as well as for the space part and the momentum part. The modified commutation relations in terms of oscillating modes are derived. Modified super-Virasoro algebras are obtained in the Ramond and Neuveu-Schwarz sectors where new anomaly terms appears. The non-commutativity affect the Lorentz covariance and the mass operator is no more diagonal in the usual Fock space. A redefinition of the Fock space is proposed to diagonalize the non-commutativity parameters matrices to obtain a diagonalized mass operator. Some restrictions on the non commutativity parameters are imposed to eliminate the Virasoro algerbra anomaly terms due to the non-commutativity, where at the same time the usual mass spectrum is obtained. The GSO projection is now possible where a space time supersymmetry is obtained. More restrictions on the non-commutativity parameters zero modes are imposed and the Lorentz covariance is restored., Comment: - 16 pages, 4 tables. - Table in page 9 was not very clear (Last colomn in the table was not fully shown). - Added 5 useful references in Introduction