Cold therapy is an effective, inexpensive, and simple intervention for pain management which is well documented in sport injuries, post-surgery and medically associated pain. Aim of the study: to evaluate the effect of superficial cold application therapy on the severity of pain among post cardiac surgery patients. Design: Quasi experiment pre and post test design was used in carrying out the study. Setting: The study was conducted at Al-Hayat Hospital, El-Fayoum in the Open Heart Surgery Intensive Care Unit. Subjects: A purposive sample consisting of 60 newly admitted adult post cardiac surgery patients. Tools: 1st tool (structured interview questionnaire), 2nd tool (Subjective and objective Pain Assessment Scale ). Results: there was a highly statistically significant decrease in pain severity post cold Gel pack application compared to pre intervention during coughing, mobility, breathing& use of spirometry among studied patients. Conclusion: pain was decreased post cold gel pack application compared to pre intervention during the procedural pain among studied patients. Recommendation: further studies are needed to confirm the impacts of the non-pharmacological therapy (cold therapy) on the severity of pain for post cardiac surgery patients.