尿道炎（英语：urethritis）指尿道发炎，属于泌尿道感染之一种。最常见的症状是疼痛或排尿困难(dysuria)。

在男性中，产生脓性分泌物通常表明淋菌性性质的尿道炎，同时明确的分泌物表示非淋菌性性质的尿道炎。尿道炎很难在妇女诊断，因为分泌物可以不存在。但是，排尿困难(dysuria)和排尿频率的症状可能存在。

Urethritis is inflammation of the urethra. The most common symptom is painful or difficult urination. It is usually caused by infection with bacteria. The infection is often a sexually transmitted infection (STI), but some are just non-STI urinary tract infections. Urethritis can be idiopathic, but it usually is not.