The aim of this quasi-experimental study was to evaluate the effects of the disaster and first aid training given to nursing students on their knowledge level on triage practices during a disaster drill. Quasi-experimental study employed a pre-test post-test design. The study was conducted on 53 nursing students. The data of the study were collected between September and December 2019. The study data were collected using the “Student Identification Form” and "Information Form on 3-Level Triage System”. The pre-test was administered to the students before receiving first aid training and it was re-administered after receiving the disaster and first aid training for 6 weeks. In the statistical analysis of the data, number, percentage values and t-test in dependent groups were used. The mean age of the students was 21.41±1.24 years; of them, 66% were female and 30.2% stated that they were generally high school graduates. The difference between the mean knowledge scores of the students before and after the disaster and first aid training was statistically significant (p=0.001). According to this study, it was determined that theoretical and practical education given to nursing students during undergraduate education had a positive effect on students' knowledge level