A RTV organopolysiloxane composition comprising (A) an organopolysiloxane containing at least two Si--OH or organoxy radicals and having a viscosity of at least 500 mPa-s at 25.degree. C., (B) an organosilane containing at least two organoxy radicals, (C) an organotin catalyst, and (D) an Si--OH radical-containing organopolysiloxane having a viscosity of up to 300 mPa-s at 25.degree. C. It has shelf stability and discoloration resistance in the uncured state and exhibits rubber elasticity and adhesion in the cured state.