A spherical activated carbon is produced from a starting pitch obtainable from a heavy hydrocarbon oil, such as petroleum tar, coal tar or ethylene, through a moderate process. The starting pitch has a softening point of at least 150° C., a toluene-insoluble content of at least 40% and a property of retaining optical isotropy even after being heated at 430° C. for 1 hour. The starting pitch is converted into a porous spherical pitch, which is then infusibilized, carbonized and activated to provide a spherical activated carbon.