Abstract Background: Low back pain (LBP) is described as pain that is felt at the back of the body, from the lower margin of the twelfth rib to the lower gluteal folds and lasts for at least one day. Non-specific chronic low back pain (NSCLBP) usually is of unknown origin or cause and can be treated through manual therapy techniques such as Lumbar Rotatory Technique (LRT). Aim: This study aimed to determine the effect of LRT on Spinal range of motion (forward flexion and backward extension), pain intensity and disability level. Method: Ethical approval for this study was obtained from the Ethics and Health Research Committee of Physiotherapy Out-patient Clinic of the University of Medical sciences, Ondo, Ondo State before commencement of this study. This pre-experimental study involved 20 patients with NSCLBP. Participants were recruited purposively, and LRT was administered after taking consent and explaining the procedure. Treatment effects were assessed in terms of spinal range of motion (forward flexion and backward extension), pain intensity and disability level using Finger-to-floor method, Quadruple Visual Analogue Scale, and Oswestry Low Back Pain Disability Questionnaire at inception, third week and sixth week of treatment. Participants underwent treatment twice weekly for six (6) weeks. Descriptive statistic of mean, standard deviation and inferential statistics of Paired T-test, Repeated measure ANOVA were used to analyse data. Alpha level was set at p˂0.05 of significance. Result: The results showed that LRT had significant improvement in week 1 forward flexion (P= 0.010), backward bending (P= 0.000), pain intensity (P= 0.000) and disability (P= 0.000). In week 3, there was significant improvement in backward bending (P= 0.000), pain intensity (P= 0.000) and disability (P= 0.000), however there was no significant improvement in forward flexion (P= 0.105). In week 6, there was significant improvement in backward bending (P= 0.000), pain intensity (P= 0.000) and disability (P= 0.000), however there was no significant improvement in forward flexion (P= 0.140). Conclusion: In conclusion, LRT has significant effect on improving SROM of patient and reducing patient’s spinal pain intensity. Keywords: Lumbar-Rotatory-Techniques, Chronic-Low-Back-Pain, Pain-Intensity, Spinal-Range-Of-Motion.