The South American opossum <i>Monodelphis domestica</i> has been a model organism for marsupials for many years and has recently been the subject of a large-scale genome sequencing effort that will provide the foundation for comparative studies of gene function and regulation. Genomic imprinting is one mechanism of gene regulation that has received increasing attention due to the impact of imprinting defects on development and disease. We have mapped the imprinted insulin-like growth factor II <i>(IGF2)</i> gene of <i>M. domestica</i> as a first step in understanding the regulatory mechanisms involved in genomic imprinting in this marsupial.