This paper develops the concept of Life-Coherent Peace as an integrative framework for human and planetary flourishing. It brings together John McMurtry’s life-value onto-axiology, Humberto Maturana’s biology of autopoiesis and love, and Johan Galtung’s peace research on direct, structural, and cultural violence. The central argument is that peace should not be understood merely as the absence of war, direct injury, or disorder, but as the organized social, ecological, economic, cultural, and relational enablement of life-capacities. McMurtry provides the value criterion: the good is that which enables a more coherently inclusive range of thought, felt being, and action, while disvalue reduces, disables, or destroys these capacities. Maturana provides the biological and epistemological grounding: living beings are autonomous, structurally coupled unities who bring forth worlds in domains of languaging and emotioning, and human coexistence becomes possible in the relational domain of love understood as acceptance of the other as legitimate in coexistence. Galtung provides the diagnostic grammar: violence is not only direct harm but also the structural and cultural organization of avoidable life-disablement. Read together, these thinkers disclose peace as life-coherent coexistence: the compossible flourishing of persons, communities, species, and planetary life-support systems. The paper strengthens this synthesis by addressing two critical challenges: first, the risk of reducing love to bureaucracy or imposing life-value through domination; second, the problem of competing life-needs when different life-enabling claims come into conflict. It therefore proposes a Life-Coherence Test and a Life-Coherence Arbitration Protocol as disciplined, dialogical methods for evaluating policies, institutions, technologies, and cultural arrangements. The paper concludes that Life-Coherent Peace is not a utopian end-state or technocratic command system, but a secular covenant for life on Earth: a shared commitment to organize coexistence so that living beings can think, feel, act, relate, and flourish without destroying the life-ground of others.