Despite their higher risk of mental health conditions, migrants often face barriers to accessing mental health care. This systematic review aims to synthesize the evidence on interventions to improve mental health care access for migrants (protocol CRD42024556575). PubMed, Embase, PsycINFO, and CINAHL were searched for experimental and observational studies on this topic. A narrative summary and a meta-analysis of the study findings are presented, along with a GRADE quality assessment. Eighteen reports, accounting for 3285 migrants, were included in the final selection. There were six randomized controlled trials, nine non-randomized clinical trials, and three observational studies. The interventions consisted of psychoeducation (27.8%), digital tools (22.2%), outreach programs, counseling, peer support (each 11.1%), and miscellaneous approaches (16.7%). There was marked heterogeneity in the intervention structure and outcome measure across the studies. Nevertheless, all studies reported a positive effect of the interventions on mental health care access. Still limited by few studies providing data suitable for the pooled estimate, the meta-analyses found a significant effect in reducing stigma and improving mental health literacy. Overall, this review identified promising interventions for improving migrant mental health care access. Future research is needed to validate interventions that can be applied sustainably across different contexts and migrant populations.