In a time ruled by neo-liberal urban governance, the role of libraries as urban commons has exponentially become crucial in fostering social equity and sustainable city-making. However, in public policy matters, libraries are barely depicted as ‘meeting places’ for neighborhoods. This study explores how libraries facilitate social interaction, community engagement, and a sense of belonging. This comparative analysis of the Feijenoord municipal library and the self-organized reading room Leeszaal in Rotterdam reveals that libraries serve not only as information centers but also as vital platforms for community empowerment and activism. The Feijenoord library emphasizes structured activities to promote social connections, while the Leeszaal encourages spontaneous interactions, fostering a flexible and inclusive community environment. The findings underline the potential of libraries in redefining social relations and action in communities. It suggests that libraries can address urban inequalities by facilitating dialogue, activism, and local initiatives. To fully recognize this potential, allocating municipal support for library initiatives becomes vital, reinforcing their role as catalysts for community building and key actors in sustainable, equitable urban development.