Introduction: Menstrual disorders pose a huge burden on gynaecology OPD, accounting for approximately 20 % of attendance of OPD. Thyroid disorders are prevalent globally, and thyroid conditions are 10 times more prevalent in women than in men. Thyroid dysfunction can prompt menstrual problems and infertility. Thyroid autoimmunity is associated with different forms of thyroid dysfunction. Objective: To assess the relationship between thyroid disorder and abnormal menstrual bleeding. Methods: Study was conducted in 100 women (age 15-45 years) suffering with menstrual disorders. Women with complaints other than menstrual disorders were in the control category. Following demographic characteristics, general physical examination and pelvic examination were performed with special reference to thyroid dysfunction. Patients were subjected to routine investigations (to rule out coagulation defects) such as Hb, BT, CT and platelets. All patients were subjected to Electro Chemiluminescence assay for T3, T4 and TSH estimation in their serum. Results: Off all the kinds of menstrual irregularities, woman with amenorrhea, menorrhagia, oligomenorrhea, polymenorrhea and metrorrhagia were recorded. 55% of the cases in the study group were euthyroid while 45% of the cases were diagnosed with having thyroid disorder. In study group out of 45 cases having thyroid disorder of which 18 (18%) were overt hypothyroid and 11 (11%) were subclinical hypothyroid. Overt Hyperthyroid were 11 (11%) and subclinical hyperthyroid were 5% in the study group. Of the total 3 amenorrhea cases 2 (2%) were euthyroid while 1 case was hypothyroid. Out of 52 menorrhagia cases, 28 were euthyroid, 14(14%) were hypothyroid and 10 (10%) were hyperthyroid. 19 were oligomenorrhea cases of which 7 (7%) each were euthyroid and hypothyroidism while one case was hyperthyroid. Conclusion: Strong correlation of thyroid dysfunction with menstrual disorders has been observed. Morbidity due to thyroid dysfunction in women can be reduced if diagnosed timely and treated accordingly and unnecessary hormonal treatment and surgery can be avoided.