A bench scale retort assembly was designed and fabricated, and semi-batch experiments were conducted at UETC on co-retorting of coal, and oil shale. Experimental results obtained in this study indicated that, although some liquid oil product is obtained from the coal, yield is not significantly greater than would be expected from separate retorting of oil shale and pyrolysis of coal. Some properties of the oil from coal/oil shale mixtures changed, as compared to oil from shale alone. These included a higher carbon/hydrogen ratio, and a higher viscosity, both of which reflected the presence the presence of greater amounts of heavy, unsaturated coal hydrocarbons. The average BTU content of the gas increased in the higher coal mixtures, correlating with the comparatively greater amounts of coal char present gasification.