This study was conducted to investigate physical, mechanical and aerodynamic properties of Jatropha seeds cultivated in Egypt. The properties were determined at moisture content of Jatropha seed 8.25 (%, d. b.). The results showed that the mean values of the %-ages by weight of seed parts to whole seed was 60.84 and 39.16 % for kernels and husks, respectively. The results also include the following properties; length, width, thickness, arithmetic and geometric mean diameter, sphericity, aspect ratio, mass of individual seed, thousand seed mass, true density, bulk density, porosity, surface area, specific surface area and projected area; their averages were found to be 17.28 mm, 11.06 mm, 8.11 mm, 12.15 mm, 11.57 mm, 67.05 %, 64.18 %, 0.598 g, 551.1 g, 0.713 g/cm3, 0.425 g/cm3, 39.89%, 421.6 mm2, 3.08 cm2/cm3 and 154.4 mm2, respectively. The mean value of angle of repose was 0.466 rad. For the coefficient of static friction; the stainless steel surface had the lowest value (0.196) while; the Plexi-glass surface had the highest value (0.403). The highest values of the rupture force, deformation ratio, hardness and the energy needed for rupture force were 101.3 N, 0.13, 105.17 N/mm and 61.7 N.mm while; The lowest values were 57.0 N, 0.05, 99.17 N/mm and 19.1 N.mm, respectively. The average values of terminal velocity and coefficient of drag were 14.27 m/s and 0.30, respectively. Also; the average value of Reynolds number was 10898 therefore; the pattern of air flow is turbulent.