This document summarizes a research project evaluating microencapsulation of diclofenac sodium using the emulsion solvent evaporation technique. Microcapsules were prepared using ethyl cellulose and chloroform to encapsulate the diclofenac sodium core material. The microcapsules were characterized based on particle size distribution, shape, drug content, encapsulation efficiency, and in vitro drug release. Spherical and discrete microcapsules between 669-759 microns in size were produced. Increasing the polymer concentration decreased the drug release rate from the microcapsules. The microencapsulation successfully produced sustained release diclofenac sodium microcapsules for further in vivo study.