One of the most significant obstacles encountered in the search for missing migrants is the lack of compatibility of data gathered by different actors. This dataset has been formulated as a means to harmonize data collection efforts by establishing a number of shared data fields that can be completed to aid the search for a missing migrant, whether living or dead. It is a basis upon which different organizations/authorities may adapt their data collection according to their context, needs, resources and mandate. As such, the dataset can serve either as a point of reference for actors already engaged in data collection, to ensure that their efforts are compatible with those of others, or as core content for a new data collection form.