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First paragraph: Grains are among the major commodities for feeding mankind. The cleaning, drying, and storage of grains are postharvest operations required to maintain their product quality [1]. They are the major subjects discussed in this section. The term grains is interpreted broadly and includes the cereal grains (maize, rice, wheat, sorghum, barley, oats, millet), the oil seeds (soybeans, sunflower seed, canola), and the pulses (edible beans). Although a grain species may require a particular postharvest operation, the fundamentals of the cleaning, drying, and storage of grains are sufficiently similar to warrant a general description of the various postharvest operations. This procedure is followed in this chapter.