The aim of the current study is to study the effect of interferential current on pain and function of chronic low back pain patients. Research methodology: Twenty patients complaining from chronic low back pain lasting more than 3 months was randomly assigned into 2 equal groups. Experimental group which received interferential current in addition to medical treatment and control group which received only medical treatment. The main outcome measures of the current study was present pain intensity (PPI) measured by McGill Pain Questionnaire and function measured by Roland-Morris Disability Questionnaire. the current study showed that there was a signicant difference between control group and interferential group regarding present pain intensity and disability index. Conclusion and recommendations: We conclude that the addition of interferential current to medical treatment in the management of chronic low back pain is essential and effective.