This research paper examines the integration of green accounting practices into product lifecycle costing (PLC) within the Fast-Moving Consumer Goods (FMCG) sector in India. Amidst escalating environmental regulations and consumer demand for sustainability, green accounting—encompassing the monetization of environmental costs and benefits—offers a transformative lens for PLC, which traditionally focuses on financial metrics across a product's lifecycle stages. Drawing from secondary data, case studies, and policy analyses, the study highlights cost efficiencies, regulatory compliance, and sustainability gains in Indian FMCG firms like Hindustan Unilever (HUL) and ITC. Findings reveal potential reductions in lifecycle costs by 10-20% through eco-efficient practices, though challenges like implementation costs persist. Recommendations advocate for standardized frameworks and technological integration to foster broader adoption.