The purpose of this study was to investigate the effect of Yoga exercises on spinal flexibility, pain and functional disability in women with chronic lumbar disk herniation. This randomized controlled trial was performed in Zahedan University of Medical Sciences, in 2010. Twenty-eight patients with chronic lumbar disk herniation were participated through simple non probability sampling. Patients were selected based on following inclusion criteria: Radicular low back pain for a period of at least 3 months, participants aged over 18 and less than 80 years old, appropriateness of exercise in accordance with clinical assessment, patients who have not been contraindicated from doing exercise based on Physical Activity Readiness Questionnaire, participants diagnosed with lumbar disc herniation by specialist and radiography. Patients were excluded if they had suspected or confirmed for serious spinal pathology, suspected or confirmed for pregnancy, spinal column surgery, insufficient treatment, using other therapeutic modalities during the study. Subjects were randomly assigned to either a Yoga exercises group (N=14) or a general exercises group (N=14). Before and after intervention, we assessed pain (ordinal) through Visual Analogue Scale, depression (Ordinal) with Beck Depression Inventory II, lumbar lordosis (degree) with flexible ruler, range of lumbar flexion (centimeter) using Modified Schober test, and disability (ordinal) with The Oswestry Disability Index. A 16 session's exercise program which lasted 8 weeks, twice per week, and 45 minutes per session was performed for both groups.