While CAR-T therapy represents a transformative immunotherapy, it is also associated with distinct toxicities that contribute to morbidity and mortality. In this systematic review and meta-analysis, we searched MEDLINE, Embase and CINAHL for reports of non-relapse mortality (NRM) following CAR-T in lymphoma and myeloma, published until 09/2023. Cumulative incidence rates of NRM and causes/numbers of death were extracted. NRM point estimates were analyzed using fixed effect models. We identified 7,788 patients across 16 clinical trials and 32 real-world studies. After a median follow-up of 12.9 months, the overall NRM rate was 7.5% (95%CI 6.9-8.1%). NRM point estimates were related to the disease entity, CAR-T product and costimulatory domain. Of 582 reported non-relapse deaths, nearly half were attributed to infections, followed by cardiovascular/respiratory events (7.4%) and second malignancies (6.5%). Our findings underline the critical importance of post-CAR-T infections and support the comprehensive reporting of NRM, including specific causes and long-term outcomes.