The knowledge of geometrical properties such as shape and size is essential for the design of processing equipment. Some geometrical properties of sunflower seed, Azargol variety as a case study, was investigated at various moisture content levels (3-14% d.b.) in three categories of big, average and small sizes. The ranges of length, width and thickness were 13.31-15.97, 5.01-7.50 and 3.11-4.38 mm, respectively. Also, the ranges of arithmetic, geometric and equivalent diameter were 5.93-8.07, 7.15-9.29 and 6.04-8.26 mm, respectively. The sphericity and surface area varied from 0.44 to 0.53 and 110.47 to 204.6 mm2, respectively.
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