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The oil extracted from seeds of the Castor Bean (Ricinus communis L.) and Jatropha (Jatropha curcas L.) has many industrial applications. However, today has given emphasis to its use in biodiesel production. Thus, the experiment was conducted during the period from 2007 to 2009, in the field and upland in Jacar farm in the City of Remigio-PB, in order to evaluate the influence of mineral and organic fertilizer in Castor Bean and Jatropha aiming to yield and also checking the quality of their oils. The experiment was conducted in a randomized block design with three replications of five treatments: absolute control (F1), waste compost I (F2), waste compost II (enriched with rock powder) (F3), mineral fertilizer (F4) and manure (F5). After harvesting the crops, it was taken from each treatment a portion of 3 kg of grain, and extracting oil from them by the method of cold pressing and chemically analyzed. Independent from the source of fertilizer, the oil content in Castor Seeds surpassed Jatropha; the sources of fertilizer significantly influenced the yield of castor oil and Jatropha; the highest yield of castor oil and Jatropha were verified with organic fertilizer using waste compost II (44.37% and 27.58%, respectively); for physics-chemical analysis, the oils of castor and Jatropha showed good quality according to specifications of the American Oil Chemists Society.