A solvent-free silicone composition for release paper, comprising: (A) an organopolysiloxane represented by the following average compositional formula (1) ##STR00001## (B) an organopolysiloxane represented by the following average compositional formula (2) ##STR00002## (C) an organopolysiloxane having alkenyl groups only at its ends, represented by the following formula (3) ##STR00003## and (D) an organohydrogenpolysiloxane represented by the following formula (4) ##STR00004## wherein the component (A) is contained in an amount of from 10 to 30 wt %, the component (B) is contained in an amount of from 10 to 30 wt %, the component (C) is contained in an amount of from 40 to 80 wt %, based on a total weight of the components (A), (B) and (C), and the component (D) is contained in such an amount that a molar ratio of the hydrogen atom or atoms bonded to a silicon atom to a total of the alkenyl groups of the components (A), (B) and (C) ranges from 1.0 to 4.0. The composition forms a tight release layer whose release force largely increases with release speed.