Work discipline is one of the factors that can reflect the performance produced by employees. This study was designed as survey research. The approach used in this research is quantitative research. It conducted this research at the Department of Industry and Trade of Central Mamuju Regency. This study's population were all employees of the Department of Industry and Trade of Central Mamuju Regency, amounting to 26 people. The data collection techniques used in this research were interviews, a list of questions, and documentation. The work environment plays a positive and significant role in work discipline at the Office of Trade and Industry in Central Mamuju District. Thus, it can conclude that the work environment will play a role in work discipline. Leadership has a positive and significant role in work discipline at the Office of Trade and Industry in Central Mamuju District. Thus, it can conclude that leadership will maintain work discipline.