In India, groundnut is the third most important oilseed crop after soybean and mustard; however, its productivity remains suboptimal due to inefficient irrigation scheduling and inadequate sulphur (S) nutrition. To address these constraints, a study was planned to evaluate the impact of different drip irrigation (DI) regimes based on pan evaporation (PE) levels (0.6, 0.8, 1.0 PE, and their stage-specific combinations) and graded S fertilization (0, 20, 40, and 60 kg S ha-1) on growth, yield, quality, and resource use efficiency of groundnut. The results demonstrated that higher DI levels, particularly 1.0 PE and 0.8+1.0 PE (moderate irrigation during vegetative and higher during reproductive stage), significantly enhanced pod and kernel yield (up to 7-fold) and haulm yield (up to 10-fold) compared to the lowest irrigation regime (0.6 PE). Although 1.0 PE yielded the highest, the 0.8+1.0 PE treatment reduced evapotranspiration by 10.7% and saved approximately 60-70 mm of water without compromising yield, thereby improving water productivity and energy efficiency. This regime also recorded the lowest carbon footprint per unit yield (CFy), indicating better environmental performance. Sulphur fertilization had a significant influence on yield and quality parameters. While groundnut responded positively up to 60 kg S ha-1, the response was most economically and environmentally efficient up to 40 kg S ha-1. The 40 kg S ha-1 level reduced carbon footprint by 2-3% and energy consumption by 3-4%, while providing comparable yields and higher benefit-cost ratios than 60 kg S ha-1. The combination of 0.8+1.0 PE irrigation with 40 kg S ha-1 emerged as the most efficient and sustainable strategy, offering a favourable balance between productivity,