Direct use of the relatively inexpensive reagent, RuCl3× H2O, as a catalyst for the reductions of olefins in the presence of water is reported. The combination of cheap and readily available sodium borohydride and a catalytic amount of RuCl3× H2O selectively reduces mono-and disubstituted olefins, whereas trisubstituted olefins, unless activated, and benzyl ethers remain inert.