This study aims to determine the Effect of Teacher Professional Competence on the Quality of Learning Processes in Office Administration Expertise Packages at Gowa 1 State Vocational School. This research is a quantitative study which shows the effect of X variables on Y variables. The population in this study is 100 people. The sample in this study was 50 people. Data collection techniques used were questionnaires, observations, interviews and documentation. While the data analysis technique uses descriptive statistical analysis and inferential statistical analysis techniques using simple linear regression analysis. The results showed that the professional competence of teachers in Gowa 1 State Vocational High School was in a very good category with a percentage level of 88 percent, for the quality of the learning process in Gowa 1 State Vocational High School categorized as very good with a 81.8 percent percentage level. This can be proven by the results of product moment analysis of 0.452 which means the level of relations in the medium category. It can be concluded that there is the Effect of Teacher Professional Competence on the Quality of Learning Processes in the Office Administration Expertise package at Gowa 1 State Vocational School.