The purpose of this study was to find out: (1) Implementation Islamic business ethics on the Karangkobar market in Banjarengara Regency. (2) The behavior of Muslim traders on the Karangkobar market in Banjarengara Regency. (3) Effect of Islamic business ethics on the behavior of Muslim traders on the Karangkobar market in Banjarnegara Regency. The sample in this study were 87 people. this research is survey research with data collection methods using questionnaires and documentation. The analysis tool used is Simple Linear Regression. The results of this study indicate that (1) Implementation Islamic business ethics in the Karangkobar market Banjarnegara Regency is good in its implementation. it means that Islamic business ethics has been perceived both by respondents Apalbila perceived by the indicators Shidiq, Fatanah, amanah, tabligh and istiqamah. (2) The behavior of traders in the Karangkobar market in Banjarnegara Regency is good in its implementation. This means that the behavior of Muslim traders has been perceived both by respondents when it is perceived by indicators of piety, piety and khidma. (3) Islamic business ethics has a significant positive effect on the behavior of Muslim traders on the Karangkobar market in Banjarnegara Regency. It means that Islamic business ethics is prescribed by Shidiq, Fatanah, trust, tabligh and istiqamah indicators can improve Muslim traders' behavior implemented in piety, aqid and khidma