The Institute of Life Cycle Assessment, Japan (ILCAJ) is a non-profit community of individuals and organizations engaged in finding and implementing solutions to environmental problems. ILCAJ supports the development, application and dissemination of science based on the life-cycle thinking for promoting a sustainable society. The scope of ILCAJ ranges from humanities to social and natural sciences and is not limited to life-cycle assessment. Since it was founded in Tsukuba in 2004, ILCAJ has attracted members from academia, industry, policy makers and consumers. As of October 1, 2025, the membership of ILCAJ amounted to 764 individuals and 43 corporations.