The general aim of this research is to investigate anxiety of foreign language lessons in different samples developmentally. In the research conducted through the screening model, the Foreign Language Course Anxiety scale was used as the data collection tool. The research for which high school and university students were chosen as sample One-way analysis of variance, Mann Whitney U test, Kruskall Wallis H test, Correlation and Regression analysis were used to analyze the data. As a result of the research, it was determined that the students who constituted the sample had low level of foreign language lesson in general and education background of the parents at high school level did not make any significant difference. A significant difference was found in the sub-dimension of speaking with foreigners in terms of mother education status at undergraduate level. Regression analysis for the undergraduate level revealed that speech anxiety in Language Courses explain 89% of the total variance and when the sub-dimension of Interest in Foreign Language Couse is added, it explains 93% of the variance. Similar results were obtained at the high school level. As a result of the research, it is considered that the students who have reasonable level of anxiety can motivate the students and increase their gains. Making foreign languages a tool for the students to use in real life and allowing them to communicate with people speaking native English or speaking English as second languages will increase their interest in the