BACKGROUND: with Europe's demographic diversity growing due to immigration, understanding and addressing the barriers to healthcare experienced by immigrants is of paramount importance. However, an updated systematic review of the literature on this topic is missing. METHODS: we systematically searched the PubMed and Scopus databases to synthesise quantitative evidence regarding self-perceived barriers to healthcare access faced by immigrants in Europe. Peer-reviewed articles, written in English, published from 2011 onwards, studying adult populations not in detention centres were eligible for the review. Articles were charted according to the population of study, sample size, geographical area and level of study (local vs national), and applied methodology (descriptive vs inferential). RESULTS: linguistic and health literacy barriers emerge as the most prominent, and most studied, barriers to healthcare for immigrants. The extant literature covers disproportionally Northern European countries
often uses small sample sizes and convenience sampling
and is particularly limited as far as the undocumented population is concerned. DISCUSSION: policies should aim at increasing the availability of interpreters and healthcare materials translated in different languages, as well as at better training health professionals to address specific immigrants' needs. We encourage future research to focus on healthcare barriers faced by immigrants in Southern and Central European contexts
to improve results' robustness and external validity by using high quality sampling techniques and larger sample sizes, and including native populations as comparison groups
and to put more attention to the experience of undocumented immigrants, as they are the immigrant population with the most critical and precarious healthcare status.