<p>To assess Eustachian tube function in mucosal type of chronic otitis media by using Foley catheter to measure opening pressure &amp; to identify the prevalence of opening dysfunction of the Eustachian tube in mucosal type of chronic otitis media. This cross-sectional study was conducted over 2 years on 112 patients with mucosal type chronic otitis media at a tertiary care teaching hospital. After ethical clearance and consent, all underwent detailed history, clinical examination. Eustachian tube (ET) function was assessed by impedance audiometry (Toynbee test) and a novel manometry technique using an 8 French Foley catheter with endotracheal cuff pressure gauge to measure opening pressure by sealing the external auditory canal. Data were analysed using descriptive statistics, with <i>p</i> &lt; 0.05 considered statistically significant. A total of 112 patients with mucosal type COM were studied, with mean age 35.7 years; majority were 20–40 years (60.7%) and males (52.7%). Impaired ET function was observed in 8% by tympanometry and 7.1% had elevated ET opening pressure (&gt; 50&#xa0;cmH₂O). Dysfunction was significantly higher in younger patients (&lt; 40 years, <i>p</i> = 0.005), while gender showed no association. All cases with residual tympanometry pressure had dysfunction (<i>p</i> &lt; 0.001), and 88.9% of dysfunction occurred with elevated opening pressure (<i>p</i> &lt; 0.001). Foley catheter opening pressure test showed 88.9% sensitivity and 99% specificity for diagnosing ET dysfunction. The prevalence of increased opening pressure of Eustachian tube was 7.1%. Foley catheter–assisted manometry using an 8 French catheter is a simple, safe, and cost-effective technique for evaluating Eustachian tube function in mucosal chronic otitis media. The method avoids general anaesthesia, reduces financial burden, and provides reliable diagnostic accuracy comparable to impedance audiometry, making it a practical tool in routine clinical settings.</p>