One of the essential characteristics of the human being as social existence is his ability to communicate with his environment. There are many ways for people to communicate. However, the most preferred form of communication in interpersonal relations was primarily speaking. Effective use of speaking skills can be said to be possible if individuals have sufficient vocabulary. This research aims to examine the vocabulary of Indonesian students learning Turkish in their oral expressions in terms of various variables. The research study group consists of 25 Indonesian students who have completed Turkish language education at the C1 level and are studying in different faculties and departments of Bursa Uludag University. The primary data of the research consists of interviews with Indonesian students who learn Turkish as a foreign language. A semi-structured interview form was used to collect data in the study. The vocabulary of Indonesian students in their oral expressions was obtained by calculating the number of words they used once, the number of different words they used, and the total number of words they used. SCP 4.07 and SPSS 25.0 package programs were used in the numerical analysis of the data. Data were analyzed with Mann-Whitney U and Kruskal-Wallis tests. In line with the findings, it was concluded that the vocabulary in the oral expressions of Indonesian students who learn Turkish shows a significant difference in the number of languages they know other than Turkish and the frequency of reading newspapers.