Background: Subclinical hypothyroidism (SCH) is a common endocrine disorder that can impact fertility. This study investigates the prevalence of SCH in women with infertility in the reproductive age group at a tertiary care hospital. Aim: To determine the prevalence of subclinical hypothyroidism in infertile women and to analyze its association with age, type, and duration of infertility. Methods: A cross-sectional study was conducted at MKCG Medical College and Hospital from June 2022 to June 2024. A total of 195 infertile women were included. Data on age, duration of infertility, serum T3, T4, and TSH levels were collected. Statistical analyses were performed to determine the prevalence of SCH and its association with various factors. Results: The mean age of the patients was 29.3±5.30 years, and the mean duration of infertility was 3.14±1.79 years. The prevalence of subclinical hypothyroidism was found to be 73.3% (143 out of 195). SCH was significantly associated with age (p=0.020), type of infertility (p=0.006), and duration of infertility. The majority of patients with SCH were in the 21-30 years age group and had primary infertility. Conclusion: The study highlights a high prevalence of subclinical hypothyroidism among infertile women. SCH is significantly associated with age, type, and duration of infertility, suggesting the need for routine screening and management of thyroid function in infertile women.