In This Paper an AC-DC Optimal power flow based nodal pricing methodology is presented. The active and reactive power generated and purchased at each bus is calculated by using OPF. Also, nodal prices can be obtained by using OPF. Here the nodal prices are important because they reflect the marginal generation and load at each bus. In general, these prices are also known as locational marginal Prices and spot prices. In this paper, for the load flow analysis, a well-known Newton-Raphson method is used and is modified to achieve compatibility for a.c.-d.c. systems with integrated d.c. links in the a.c. network. This Paper use the MATLAB Software to determine the OPF based Nodal pricing scheme without violating system constraints. This approach has been demonstrated by simulating the study with IEEE30 bus system and conclusions are drawn.