The research was conducted to investigate the correlation between students’ positive self-talk strategy and their speaking performance in oral presentation at English Language Education Department of a private university in Yogyakarta through correlational research design. The purposes of this research was to find out students’ positive self-talk strategy, students’ speaking performance, and the correlation between the two in oral presentation. In this research, the researcher used simple random sampling as a technique to take the sample of the data. The data were collected from 96 university students batch 2015 at an English Language Education Department of a private university in Yogyakarta. There were two research intruments of this research, questionnaire and document. Questionnaire was used to measure the students’ positive self-talk strategy and document was used to measure students’ speaking score in oral presentation. Data of this research were analyzed using correlational design. The result of this research showed that students’ positive self-talk strategy was in an excellent category with the mean score of 3.46 and the students’ speaking performance in oral presentation belongs to intermediate category with the mean score 24.03. The result showed that the significance 2-tailed in this research is lower than the significant level of 0.05. It indicated that there was a correlation between students’ positive self-talk strategy and their speaking performance in oral presentation. Therefore, the alternative hypothesis of this research was accepted.