The first catalytic enantioselective β-hydroxylation of α,β-unsaturatedaldehydes is presented. Using commercially available (E)-benzaldehyde oxime in the presence of 2-[bis(3,5-bis-trifluoromethyl-phenyl)trimethyl-silanyloxymethyl]pyrrolidine as organocatalyst, the corresponding chiral carbonyl β-oxime ethers are obtained in high yields and with excellent enantioselectivities. These optically active