Aim: The present investigation was carried out to evaluate the response and fix an optimize source and levels of S for sunflower production. Materials and Methods: Field experiments were conducted in the Experimental Farm of the Department of Agronomy, Annamalai University, Annamalai Nagar during March - June and June - September 2014 in RBD to study the response of sunflower (Helianthus annuus L.) var. K-1 to different sources and levels of sulphur (Elemental sulphur, Gypsum and Pyrite for their growth, yield attributes, and yield. Result: Among the different treatments Elemental Sulphur @ 45 kg ha-1 along with RDF (40:20:20 kg ha-1) had a positive effect on growth, yield attributes, yield and nutrient uptake in sunflower for I and II crops. The lowest values of growth, yield attributes and yield were recorded by 0 kg S ha-1 along with RDF. Conclusion: Application of sulphur especially through Elemental sulphur @ 45 kg ha-1 along with RDF (40:20:20 kg ha-1) is a fitting practice for augmenting sunflower yields in clay loam regions of Cuddalore district sunflower farmers.