The three Baltic states: Estonia, Latvia, and Lithuania, gained independence for the second time in the late 20th century, and are now investing in the whole society’s approach to defence, recognizing the threat from Russia, especially after the wars in Georgia (2007/8) and Ukraine (2014, 2022). Voluntary territorial defence forces are an important constituent of their national defence strategies. This paper aims to analyse these forces as an integral component of national security, based on a close connection with society, armed forces, and government. The similarities and differences between the three different volunteer forces will be highlighted and ultimately proven how they are strongly embedded in national and regional security setup, while also enhancing cross-border cooperation.