Green finance has become a key instrument for promoting sustainable development, particularly in emerging economies where environmental investment demands are rapidly increasing. This study examines the influence of financial capacity, market support, and sustainability culture on green bond issuance decisions (GBI) among listed construction and real estate firms in Vietnam. Using primary data collected through a structured survey and analyzed through multiple regression techniques in SPSS, the study evaluates the relationships between financial capacity (ACC), market support (SUP), sustainability culture (CUL), and green bond issuance decisions (GBI). Diagnostic tests confirm that the regression model satisfies classical assumptions, with variance inflationfactors (VIFs) below 3 and statistically significant ANOVA results. The model explains 29.4% of the variance in green bond issuance decisions. The findings indicate that financial capacity has a statistically significant positive effect on green bond issuance decisions, whereas market support and sustainability culture do not demonstrate statistically significant effects. These findings suggest that internal financial readiness remains the primary determinant of green financing adoption in Vietnam’s construction and real estate sector