The growing critical reception of mainstream mindfulness interventions often concerns itself with the social and ethical dimensions of mindfulness practices and their current inability to effectively address social and ecological problems. While Buddhists often advocate recontextualizing the practices in their original ethical frames, such proposals inadequately account for Buddhism’s historic biases and secular practitioners’ unwillingness to conform to Buddhist norms. Likewise, secular practitioners who argue that ethics implicitly informs mindfulness, but who forgo explicit ethical considerations, are often uncritical of the inner workings of power and injustice shaping mindfulness. This paper presents a dual critique of Buddhist and secular approaches to mindfulness, and attempts to outline dialectical and integral approaches that synthesize aspects of both. This dual critique lends itself to a post-secular synthesis of ethics and mindfulness, as irreducible aspects of each other informed by a non-binary understanding of religion and secularism. Finally, this synthesis is explored in light of several existing theoretical and practical examples of contemplative practices developed to support personal, social, and ecological transformation.