Objectives: This cross-sectional study aimed to determine eating behaviors and the prevalence of orthorexia nervosa (ON) among nursing students, factors associated with eating behaviors and ON, and the relationship between eating behaviors and ON. Methods: The study sample included 181 students selected using a method for a sample with a known population with 90% power range and 95% confidence level. The data were collected using a Personal Information Form, Eating Attitude Test (EAT-40), and Orthorexia-11 Scale (ORTHO-11). The resulting data were evaluated using SPSS 15.0, a software package for statistics. The data were analyzed using Student t test, chi-square test, and Pearson correlation analysis in frequency, mean, and percentage, and the type 1 error level was accepted to be p>0.05. Results: Of the students, 84.5% were found to be at risk according to EAT-40, and 45.3% were found to be at the risk of developing ON. Their EAT-40 mean score was 17.76±12.34 and ORTHO-11 mean score was 27.34±4.53. The students' sociodemographic characteristics and their EAT-40 mean score were compared, and the prevalence of eating disorders was found to be higher among those whose fathers completed primary school or had higher education, who watched their calorie intake, and who had a fear of gaining weight. Furthermore, the students' sociodemographic characteristics and ORTHO-11 mean score were compared, and those who cared about proper nutrition and had a fear of gaining weight had a higher tendency to develop ON. A low negative correlation was found between EAT-40 and ORTHO-11 (r=-.162; p=0.027). Conclusion: Almost three thirds of students were found to be at risk of eating behavior; nearly half of them were found to be at risk of developing ON. Those with a fear of gaining weight had a higher tendency to both have eating disorders and develop ON.