Objective: The purpose of the study was to determine healthy lifestyle behaviours and affecting factors of first year students who attend to Dokuz Eylül University Faculty of Medicine for 2011-2012 academic year. Methods: The study design is cross-sectional.The study included 215 first year students who attend to Dokuz Eylül University Faculty of Medicine. Dependent variable was healthy lifestyle behaviour. Independent variables were gender, residence, the setting for long term residence, economic status and health perception, educational level of mother and father, job of the head of household, presence of chronic disease. Data were collected with self administered questionnaire. Data were analyzed with t test, Mann-Whitney U test, ANOVA, Kruskal Wallis Analysis of Variance. Results: The students who have fragmented family compared to ones without; the students who live with their family compared to ones living at dormitory; the students whose health perception is mild compared to ones with good- very good health perception were more physically active. Spiritual development and total scores of the students,whose economic status perception was bad-the worst, were lower compared to the students with mild and good- very good economic status perception.. Interpersonal relations of the students were lower among those with bad-the worst economic status perception compared to ones with good- very good economic status perception is. Conclusion: The students who live with their family; the students who have fragmented family; the students whose health perception is mild; the students whose economic status perception is good-very good were more healty lifestyle behaviours score.