In order to accurately analyze gene function in transgenic mice, as well as to generate credible murine models of human diseases, the ability to regulate temporal- and spatial-specific expression of target genes is absolutely critical. Pioneering work in inducible transgenics, begun in the 1980s and continuing to the present, has led to the development of a variety of different inducible systems dedicated to this goal, the shared basis of which is the accurate conditional expression of a given transgene. Recent advances in inducible transgene expression in mice are discussed.