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ABSTRACT. Smartphones are mobile phones that have capabilities and functions like computers. Along with the sophistication of technology makes the habits of smartphone users become inefficient such as the use of a long time and the close distance of a smartphone with the eye, of course, this behavior causes problems in eye health, one of which is eyestrain. The purpose of this study was to determine the correlation between the use of smartphone behavior and eyestrain in the College of Foreign Languages (STIBA) Saraswati Denpasar. This study employed a correlation analysis design with a cross-sectional approach. To conduct this study, 186 respondents were recruited as the sample through simple random sampling technique. The data were collected using a questionnaire. Findings indicated that the use of smartphone behavior in most students was in good category (53.8%) and the number of students experiencing eyestrain was 91.4%, with mostly the complaints was headaches (56.5%). The test results of Spearman rho obtained a correlation value of 0.714 (ρ value> 0.05). This study shows there is no correlation between the use of smartphone behavior and eyestrain at the College of Foreign Languages (STIBA) Saraswati Denpasar. The implications of this study are expected that students can maintain eye health, especially reduce the use of smartphones in the long term and use the appropriate distance.