Introduction The COVID-19 pandemic had devastating health and socio-economic effects, partly due to mitigating policy choices. There is little evidence of approaches that guided policy decisions in settings that had limited modelling capacity pre-pandemic. We sought to identify knowledge translation mechanisms, enabling factors, and structures needed to translate modelled evidence to policy decisions effectively. Methods We utilised convergent mixed methods in a participatory action approach, with quantitative data from a survey and qualitative data from a scoping review, in-depth interviews, and workshop notes. Participants included researchers and policy actors involved in COVID-19 evidence generation and decision-making. They were mostly from lower- and middle-income countries (LMICs) in Africa, Southeast Asia, and Latin America. Quantitative and qualitative data integration occurred during data analysis through triangulation and during reporting in a narrative synthesis. Results We engaged 147 researchers and 57 policy actors from 28 countries. We found that the strategies required to use modelling evidence effectively include capacity building of modelling expertise and communication, improved data infrastructure, sustained funding, and dedicated knowledge translation platforms. The common knowledge translation mechanisms used during the pandemic included policy briefs, face-to-face debriefings, and dashboards. Some enabling factors for knowledge translation comprised solid relationships and open communication between researchers and policymakers, credibility of researchers, co-production of policy questions, and embedding researchers in policymaking spaces. Barriers included competition among modellers, negative attitude of policymakers towards research, political influences and demand for quick outputs. Conclusion Our findings led to the co-development of a knowledge translation framework useful in various settings to guide decision-making, especially for public health emergencies. Furthermore, we provide a contextualised understanding of knowledge translation for LMICs during the COVID-19 pandemic. Finally, we share key lessons on how knowledge translation from mathematical modelling complements the broader learning agenda related to pandemic preparedness and long-term investments in evidence-to-policy translation.