The Linked Immunisation Action Network has supported Indonesia in addressing critical immunisation challenges through peer-to-peer learning and tailored interventions. Amidst COVID-19-related backsliding (DTP3 coverage dropped from 85% in 2019 to 67% in 2021), Indonesia engaged in collaborative learning exchanges to tackle human resource gaps, data system limitations, and subnational inequities. Key initiatives included a study tour to Sri Lanka on supportive supervision, which informed a pilot program in Central Java, improving health worker capacity and reducing vaccine hesitancy. Learning from Australia’s Electronic Immunisation Registry (EIR), Indonesia developed an e-notification system via WhatsApp and Satu Sehat mobile, enhancing data-driven targeting of zero-dose children. A subnational peer-learning network connected districts to share strategies, leading to innovations like cost-saving community workshops and improved data validation. These efforts underscore the value of adapting peer-tested strategies, integrating technology for real-time monitoring, and fostering decentralized collaboration to strengthen equity and sustainability. For practitioners, Indonesia’s experience highlights the importance of structured peer exchanges, responsive digital tools, and empowering subnational stakeholders to address systemic barriers in immunisation programs.