A 60-year-old female was referred to our hospital for the treatment of chronic urinary retention which had compelled her to continue clean intermittent self catheterization (CIC) for several years. After further examination including physical examinations, urodynamic study, cystography, and urethrocystoscopy, she was diagnosed with primary bladder neck obstruction (PBNO). Transurethral resection of the bladder neck (TURBN) was performed to relieve the bladder outlet obstruction and she was free from CIC thereafter. Another 61-year-old female on CIC was also referred to our hospital and diagnosed with PBNO through detailed examinations including urodynamics. She was also successfully relieved of CIC after TURBN. Primary bladder neck obstruction is a condition which can be effectively treated by a less-invasive procedure when properly diagnosed by urodynamic examination. Urologists must keep this rare condition in mind as a possible cause of chronic urinary retention in women.