Background Migrants, including refugees, asylum seekers, labour migrants, and undocumented migrants, now constitute a considerable proportion of most high-income countries' populations, including their skilled and unskilled workforces. Migrants may be at increased risk of
COVID-19 MESHD due to their health and social circumstances, yet the extent to which they are being affected and their predisposing risk factors are not clearly understood. We did a systematic review to assess clinical outcomes of
COVID-19 MESHD in migrant populations (cases, hospitalisations,
deaths MESHD), indirect health and
social impacts MESHD, and to determine key risk factors. Methods We did a systematic review following PRISMA guidelines, registered with PROSPERO (CRD42020222135). We searched databases including PubMed, Global Health, Scopus, CINAHL, and pre-print databases (medRxiv) via the WHO Global Research on
COVID-19 MESHD database to Nov 18, 2020 for peer-reviewed and grey literature pertaining to migrants (defined as foreign born) and
COVID-19 MESHD in 82 high-income countries. We used our international networks to source national datasets and grey literature. Data were extracted on our primary outcomes (cases, hospitalisations,
deaths MESHD) and we evaluated secondary outcomes on indirect health and social impacts, and risk factors, using narrative synthesis. Results 3016 data sources were screened with 158 from 15 countries included in the analysis (35 data sources for primary outcomes: cases [21], hospitalisations [4]; deaths [15]; 123 for secondary outcomes). We found that migrants are at increased risk of infection and are disproportionately represented among
COVID-19 MESHD cases. Available datasets suggest a similarly disproportionate representation of migrants in reported
COVID-19 MESHD deaths, as well as increased all-cause mortality in migrants in some countries in 2020. Undocumented migrants, migrant health and care workers, and migrants housed in camps and labour compounds may have been especially affected. In general, migrants have higher levels of many risk factors and vulnerabilities relevant to
COVID-19 MESHD, including increased exposure to SARS-CoV-2 due to high-risk occupations and overcrowded accommodation, and barriers to health care including inadequate information, language barriers, and reduced entitlement to healthcare coverage related to their immigration status. Conclusions Migrants in high-income countries are at high risk of exposure to, and infection with,
COVID-19 MESHD. These data are of immediate relevance to national public health responses to the pandemic and should inform policymaking on strategies for reducing transmission of
COVID-19 MESHD in this population. Robust data on testing uptake and clinical outcomes in migrants, and barriers and facilitators to
COVID-19 MESHD vaccination, are urgently needed, alongside strengthening engagement with diverse migrant groups.