Background: Low back pain is a pain syndrome occurring on the low back regions are the result of a variety of reasons. It is often experienced by those who work with the wrong posture. Based on data known to the high proportion of physiotherapy visits disobedience do physiotherapy in patients LBP (71.7%) in the General Hospital Pirngadi Medan year 2016. Object: To identify relationship between family support and adherence to physiotherapy in low back pain patients. Methods: the research used descriptive correlation quantitative with cross sectional approach. The instrument used questionnaires. Data were taken on 125 respondents with the randomly selected a simple (simple random sampling) and analyzed by Chi-square test, Results: The result showed ratio prevalence 95% CI family support between adherence to physiotherapy were 1,792 (1,031-3,114), and correlated with significantly p=0.046. Conclusion: There was a significant relationship between family support with adherence to physiotherapy.