The purpose of this study is to evaluate the foot care self-efficacy of diabetic foot patients and the effect of an educational intervention for improving it. This study was of a semi-experimental design and was conducted between January and December 2019 in a diabetic foot council of a university hospital. After power analysis to determine sample size, 33 participants meeting the inclusion criteria were included in the study. A Patient Identification Form and Diabetic Foot Care Self-Efficacy Scale (DFCSES) were used to collect data. Of the patients, 51.5% were male and the mean age was 54.91 +/- 16.61 years. The mean score of DFCSES was 50.18 +/- 20.88 before education and 72.67 +/- 20.74 after education. The educational intervention has large effects on self-efficacy (d= 1.233), perceived knowledge level on diabetic foot (d= 1.102), perceived health status (d= 0.859), and perceived quality of life (d= 0.807). Educational intervention was found to be an effective way to improve foot care self-efficacy, perceived knowledge level on diabetic foot, perceived health status, and perceived quality of life.