Smartphone addiction is a overuse of mobile device, usually quantified as the number of times the users access their devices. Aim of study was to assess the effectiveness of structured teaching programme on attitude regarding health hazards of mobile phone addiction. Quantitative research approach was used with Non-Randomized pre- test post-test control group design. Non-probability Convenient Sampling Technique was used to select sample. Sample size was 100 i.e. 50 for experimental group and 50 for control group. Result of the study revealed that Paired t-test in experimental group mean pre-test and post-test attitude score was t=13.50 which was significant at 0.05 level of significance. In control group mean pre-test and post-test attitude score was t=1.15 which was non-significant at 0.05 level of significance. Unpaired t-test in experimental and control group mean post-test attitude score t=11.43 which was significant at 0.05 level of significance. Significant correlation in experimental group between, pre-attitude and post attitude r=0.375 at 0.05 level of significance. Association of attitude score with selected demographic variables in experimental and control group was not statistically significant. Conclusion of the study showed that Structured Teaching Programme was effective in improving attitude regarding health hazards of mobile phone addiction among school students.