A curable silicone composition which comprises (A) a diorganopolysiloxane which has a viscosity of about 50 to 500 mPas at 25.degree. C. and has silicon-bonded alkenyl groups only at the molecular chain ends, (B) a diorganopolysiloxane which has a viscosity of about 50,000 to 500,000 mPas at 25.degree. C. and has silicon-bonded alkenyl groups only at the molecular chain ends, (C) an organohydrogenpolysiloxane which has at least eight silicon-bonded hydrogen atoms per molecule and has a viscosity of about 3 to 15 mPas at 25.degree. C., and (D) a catalytic amount of a platinum-group metal catalyst as essential components, wherein said composition has a viscosity of about 100 to 1,000 mPas at 25.degree. C.; and a sheet having a releasability comprising a cured coating film of the composition.