AIM: In this study our aim was to compare the socio-demographic factors associated with internet addiction and loneliness level among nurses and determine a correlation between the two. METHODS: This descriptive and cross-sectional study was conducted with all volunteered nurses (N=361). Who had not had psychiatric diseases, and working in two hospitals, in Balıkesir Province Turkey between January 15 and December 15, 2015. A total of 203 nurses participated in this study, and all data were collected using the personal information form, Internet addiction scale and University of California, Los Angeles (UCLA) Loneliness Scale. Ethics Committee approval was received for the application of the research. In the analysis of the data, percentages, Mann-Whitney U, One Way ANOVA, Dunnett's test and Spearman correlation analysis were used. RESULTS: The mean internet addiction and loneliness scores of the nurses were found to be lower relative to the lowest and highest mean scores that could be obtained from these scales. Internet addiction scores were found to be higher in males aged 35 years or below, those who used the internet at the service, spent more than 1 h online compared with females aged 36 years or above, those who did not use the internet at the service or spent less than 1 hour online, respectively. A weakly positive linear correlation was found between the loneliness score and problematic social relation and internet addiction of the nurses. CONCLUSIONS: There was a weak positive relationship between loneliness and internet addiction scores in nursing group in the study. Investigation of the internet addiction with a larger sample is recommended.