Castor seed cake is the byproduct of castor seeds with cold pressing. This bio-waste was used as a raw material for the production of bio-oil and activated carbons through pyrolysis. De-oiled castor seed cake was pyrolyzed at various temperatures for various durations to find out the optimal temperature and duration for the pyrolysis. The highest bio-oil yield (63% w/w) was obtained at 400 degrees C for 60 min. The ultimate analysis and the fuel properties for the produced bio-oil were determined. Fourier transform infra-red spectroscopy and fractionation using column adsorption chromatography for bio-oil were also conducted. The results showed that the properties of bio-oil were similar to those reported in the literature. The pyrolysis char was converted into activated carbons of micro-porous structure.