An international research collaboration answered, "Can equity in perinatal health for migrant women be measured for comparison across countries?" In nine countries, perinatal databases were assessed for the availability of equity indicators. Equity data were also sought from women and health records. Optimal sources of data differed depending on the migrant perinatal health equity indicator. Health and migration data, required to capture equity, were often not reported in the same location. Migration indicators other than country of birth were underreported. Perinatal health equity can be measured for international comparisons, although a standardized protocol is required to capture all indicators.