BactiVac was established in 2017 at the University of Birmingham and is directed by Profs Cal MacLennan and Adam Cunningham. BactiVac’s mission is to advance vaccine development against global bacterial infections in humans and animals through a One Health approach, reducing disease, death, and antimicrobial resistance, and thereby enhancing economic development. BactiVac brings together members based in academia and industry, policymakers and funders from highincome countries (HICs) and low- and middle-income countries (LMICs). The Network has over >1,800 members from 88 countries, including 50% based in LMICs and 15% in industry. BactiVac supports vaccine development through Catalyst Project Awards and Catalyst Training Awards. This funding targets bottlenecks and capacity-building in vaccinology, particularly among LMIC early career researchers. The BactiVac Network provides advocacy for bacterial vaccines nationally and internationally and, by partnering with aligned networks, functions as a network within a network of networks. Therefore, through providing financial support and facilitating collaboration, BactiVac supports and enhances the bacterial vaccinology community and helps reduce the devastating burden caused by bacterial infections.