Background: Supervision is one of the techniques used to improve nurses' competence. So, nurses required talented supervisors, supervisors within hospitals have a great deal of influence over the work lives of nurses and directly shape the experience of them through the supervisory style they utilized either abusive or coaching supervision. So, the aim of this research was to assess nurses' perception about abusive as well as coaching supervision and its relation with their competence. Research design: A descriptive correlational design was utilized in the current research. Setting: The research was conducted at Minia Oncology Institute. Sample: Nurses who experience more than one year in working (no.106). Tools of data collection: Four scales were used in this research, the first scale was sociodemographic data, the second scale was nurses' perception of abusive supervision scale, the third scale nurses' perception of coaching supervision scale and the fourth scale nurse competence scale. Results: The majority of nurses had low perception level of abusive supervision, more than two third of them had high perception level of coaching supervision and less than two third of them had high level of competence. Conclusion: There was negative correlation between total abusive supervision and total coaching supervision (P =0.044) and there was negative correlation between total abusive supervision and total nurses' competence (P = 0.940). While there was positive correlation between total coaching supervision and total nurses' competence (P =0.239).  Recommendations:  Apply a continuous, regular, adequate and constructive evaluation of supervisors and their supervision style by institute administration.