This paper probes beneath the surface of the revitalized religiosity and thriving “civic Buddhism” that is identifiable in parts of Thailand’s rural periphery today as a result of grassroots processes of change. It exemplifies Phra Phaisan Visalo’s assertion (1999:10) that Thai Buddhism is “returning to diversity” and “returning again to the hands of the people.” Using in-depth case studies of three influential local monks in the northeastern province of Yasothon, it develops three cross-cutting themes that are of significance not only as evidence of a process we term “relocalization” but also as issues that lie at the heart of contemporary Thai Theravāda Buddhism. The paper explores how the teachings and specific hermeneutics of influential Buddhist thinkers like Buddhadāsa Bhikkhu, Phra Payutto and Samana Phothirak have been communicated, interpreted, adjusted and implemented by local monks in order to suit specific local realities and needs. Added to this localization of ideas is the localization of practice, wherein the three case studies reveal the quite different approaches and stances adopted by a “folk monk” (Phra Khruu Suphajarawat), a “forest monk” (Phra Mahathongsuk) and what might loosely be termed a “fundamentalist monk” (Phra Phromma Suphattho) at the interface of monastery and village, or the spiritual (supramundane) and social (mundane) worlds. This articulation of Buddhism and localism in turn feeds the debate concerning the appropriateness or otherwise of social engagement and activism in connection with a monk’s individual spiritual development and the normative function of the monk in modern Thai society.