Quantum dot cellular automata is one of the most efficient and emerging technology which mainly deals with the effect of electrons inside the quantum dots, and it is the best alternative technology in the nano level architectural field. In this paper we have designed a 4:1 MUX, which is more efficient and is also superior to the other recent designs. The proposed design includes reduction in cell count, area of the circuit, area of the cells and it improves the accuracy of the output. The results have been analyzed using QCA Designer.