Introduction: In India, approximately 13-19 million couples are likely to be infertile as per data from Indian Council of Medical Research (ICMR). Thyroid disease is more common in women than in men. Because most thyroid disease is autoimmune in nature, an increased susceptibility to autoimmune diseases, perhaps secondary to the female endocrine environment, could be a contributing factor. Therefore this study was carried out to the prevalence of abnormal thyroid function in infertile women. Materials and Methodology: The sample size that has been calculated for this study was 350 which followed the inclusion criteria of those infertile married women aged between 20 – 35 years who had been married for more than 1 year attending the gynaecology department at PCMS and RC. Five millimetres of venous blood was collected in fasting state. Serum was prepared within one hour of blood collection and stored at -20°C till get analysed for thyroid function test. Results: 51.4% of the infertile women fall under the category of 26 – 30 years. Women in the age range of 21 – 25 years recorded the least number of cases that was recorded to be 16%. Conclusion: Thyroid dysfunction is one of the important aetiology for infertility which can be managed easily with appropriate management. Therefore screening the thyroid gland for dysfunction is mandatory in almost all the infertile women.