An experimental arrangement was developed to determine the static and dynamic coefficients of friction of sunflower seed and its kernel. These friction coefficients were determined on six different surfaces at five moisture contents between 4 and 20% d.b. The nature of the surface and moisture content of the samples gave rise to significant variations in static and dynamic coefficients of friction. At any moisture level and for a particular surface both the friction coefficients were greater for sunflower kernel than for seed. Among the surfaces tested, rubber exhibited the highest coefficient of friction for both sunflower seed and kernel which was followed by plywood, mild steel, galvanized iron, aluminium and stainless steel. Considering the entire range of moisture content of the sample, the static coefficient of friction of seed varied from 0)351 to 0)472 and 0)514 to 0)651 for stainless steel and rubber, respectively, while that of kernel varied from 0)372 to 0)601 and 0)532 to 0)781. Corresponding values of dynamic coefficient of friction were found to vary from 0)304 to 0)441 and 0)447 to 0)593 for seed, and from 0)324 to 0)557 and 0)476 to 0)734 for kernel. Surface velocity between 0)09 and 0)29 m/s had only a small effect on the dynamic coefficient of friction for both seed and kernel when tested against stainless steel at a moisture content of 4)5% d.b.