Stroke is one of the principal cause of increased morbidity and mortality worldwide, and it is one of the leading cause of physical and functional impairments. It has also been considered as a significant health problem which may induce disability Spasticity and abnormal posture are common feature of stroke. It is most often found in the flexor group of muscle in upper limb and extensor group of muscle in lower limb. This study aims to find out the immediate and sustained effect of proprioceptive neuromuscular facilitation (PNF) technique on upper limb spasticity in stroke patients. Thirty stroke patients with spasticity of upper limb were selected by convenient sampling. Modified Ashworth Grading Scale (MAS) was used as outcome measure. These thirty patients received upper limb PNF pattern and technique. This was one-time intervention. Post-intervention the result was highly significant for immediate effect, after 30 minutes the result was highly significant and later after 2hours the result was insignificant. The study concluded that there is a positive immediate effect on reducing the spasticity using PNF technique, and the sustainability of the technique was significant till 30 minutes after intervention but later after 2 hours the effect was insignificant. Further more functional activity can be added to maintain the effect of PNF technique for longer duration.