This study aims to examine the effect of coaching on teamwork, using a quantitative approach to test whether there are significant differences. The research sample was 15 employees who joined in one teamwork at the same company. The results show that the correlation between before using coaching and after its use is very strong and significant. So that it can be said that there is a significant difference in teamwork after being given coaching. Thus it is proven that coaching affects teamwork performance. Results are seen three months after coaching is taught. This is intended to see whether it can really be applied to the work team. The results found that there were very significant differences in the work team before and after coaching was taught.