In this communication, we report that substrate-controlled 1,5-syn and -anti stereoinduction in the aldol reaction of B-tris(trialkylsilyl)siloxy methyl ketones can be achieved with high diastereoselectivities. Tris(trialkylsilyl)silyl groups are easily prepared and play an important role in the selectivities of these reactions. Furthermore, all of the 1,3,5-triot stereoisomers can easily be prepared from beta-siloxy methyl ketones in no more than three steps.