Crop production largely depends on need based application of nutrients and for maximizing the yield of mustard, it is essential that mustard should not suffer due to inadequate supply of mineral nutrition. In this regard, a field experiment was conducted at Research Farm, Vivekananda Global University, Jaipur during Rabi season of 2018-19, to study the effect of nitrogen and sulphur on yield and economics of mustard [Brassica juncea (L.)]. The experiment was laid out according to randomized block design with three replications. The treatments consisting of nine treatment combinations viz., 125% RDN + Sulphur 10 kg ha-1 (T1), 125% RDN + Sulphur 20 kg ha-1 (T2), 125% RDN + Sulphur 30 kg ha-1 (T3), 100% RDN + Sulphur 10 kg ha-1 (T4), 100% RDN + Sulphur 20 kg ha-1 (T5), 100% RDN + Sulphur 20 kg ha-1 (T5) 100% RDN + Sulphur 30 kg ha-1 (T6), 75% RDN + Sulphur 10 kg ha-1 (T7), 75% RDN + Sulphur 20 kg ha-1 (T8) and 75% RDN + Sulphur 30 kg ha-1 (T9) were applied to the mustard var. Laxmi (RH-8812). Results showed that the yield attributes (number of siliquae plant-1 and number of seeds silique-1), yield (seed, stover and biological yield) and economics (net returns and B: C ratio) of mustard was significantly increased due to different nitrogen and sulphur treatments. The maximum number of siliquae plant-1, number of seeds silique-1, seed yield, stover yield and biological yield of mustard was obtained with the application of 125% recommended dose of nitrogen + 30 kg sulphur ha-1 (T3). Similarly, the same treatment also produced maximum net returns and benefit: cost ratio of mustard. So, this treatment was recommended for obtaining maximum yield with increased monetary returns.