<![CDATA[IntroductionGreen waqf offers an Islamic philanthropic mechanism for financing environmental conservation and sustainable development in Indonesia. Despite its potential to support climate action, ecosystem protection, and renewable resource management, public participation remains limited, while the behavioral drivers of green waqf differ across generations. Understanding these differences is necessary for designing effective strategies that connect charitable giving with environmental responsibility.ObjectivesThis study examines the determinants of intention to donate to green waqf and compares their effects across Generations Z, Y, and X. It evaluates the roles of religiosity, subjective norms, product knowledge, trust, environmental knowledge, and attitude within an extended Theory of Reasoned Action framework.MethodA quantitative cross-sectional design was employed using an online questionnaire distributed to respondents across several regions of Indonesia. A total of 220 valid responses were analyzed, comprising 84 Generation Z, 74 Generation Y, and 62 Generation X participants. The relationships among constructs were tested using Partial Least Squares Structural Equation Modeling, while intergenerational differences were examined through Multi-Group Analysis after measurement invariance assessment.ResultsAttitude significantly predicts intention to donate to green waqf across all three generations and represents the most consistent behavioral determinant. Product knowledge also directly influences intention across Generations Z, Y, and X. Religiosity and subjective norms consistently shape attitudes, although their direct effects on intention are limited. Religiosity directly influences intention only among Generation Z, while environmental knowledge directly influences intention only among Generation Y. Trust directly affects Generation Z intention but contributes more strongly to attitude formation among Generations Y and X.ImplicationsGreen waqf institutions should adopt generation-sensitive strategies. Religious framing and institutional trust are especially relevant for Generation Z, environmental information is more influential for Generation Y, and transparent governance and rational evaluation are particularly important for Generation X.Originality/NoveltyThis study contributes to green waqf and Islamic philanthropy literature by demonstrating that the determinants of charitable giving intentions are not uniform across generations. It extends the Theory of Reasoned Action by integrating religious, cognitive, environmental, and institutional factors within an intergenerational model of green waqf participation.]]>
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