Plant growth regulator (PGR) is a non-nutritive organic substance that can change plant physiological activities at a very low concentration. Field experiments were conducted at Kalyani D Block Farm, Kalyani, Nadia under Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, West Bengal during rabi and kharif seasons of 2017-18 and 2018-19. Six different treatments including sodium para-nitrophenolate (Na-p-NP) 0.3 % SL (at 4, 8 and 16 ml L^-1), triacontanol (TRIA) 0.1 % EW at 250 ml ha^-1, alpha naphthyl acetic acid (NAA) 4.5 % SL at 10 ppm and untreated control were evaluated in rabi and kharif chillies (var. Bullet Chilli) in Inceptisol. All the PGRs were applied for three times as foliar application in both the seasons at 25, 45-50 and 65-70 days after transplanting (DAT). The results revealed that the growth attributes (plant height, number of secondary branches and flowers plant^-1) were significantly improved with the application of Na-p-NP at 16 ml L^-1. It also improved the yield attributes (number of fruits plant^-1, fruit weight, length, width) and ultimately the fruit yield during both the seasons. There was no significant effect of PGRs on number of primary branches plant^-1, days to 50% flowering and maturity of chilli crop.