In this study, Entropy generation in MHD convective flow past a flat porous oscillating plate with suction or injection are presented for an unsteady, one-dimensional flow of a viscous incompressible fluid. The importance of Entropy generation is noticed in industrial and scientific fields including heat transfer in thermal systems which includes viscous dissipation, chemical reaction, mass transfer, heat transfer, and electrical conduction etc. The role of flow parameters like magnetic parameter, Radiation parameters, Grashof number, Heat generation/absorption, irreversibility distribution ratio on entropy generation are presented and elaborated through graphs. The obtained results reveal that for various values of Hartmann number, the entropy generation and Bejan number are increased, a larger radiation parameter increases the entropy generation and the Entropy generation due to viscous irreversibility decreases with the increase in Grashof number and Hartmann number.