This research examined the effect of competency of project managers on project success in Ethiopian Airlines Group. To achieve the objective of the research, the study used a quantitative research method and explanatory research design. Data for the assessment were obtained from 43 selected respondents (project managers) from three different sections through a five point Likert scale-based questionnaire. Analyses were done based on three competency variables – knowledge, skill, and attitude.

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... ults revealed that Pearson correlation among project managers' competencies are moderate to high, correlation among project's success elements are also moderate to high, and correlation between project managers' competencies and project success are also high to very high. Regression analysis results also showed that all the three project manager competency variables have strong effect/impact on project success, skill has the highest impact followed by knowledge and finally attitude having significant impact. There was 82.0 % change in project success attributed to the combined effect of the independent variables in the model (Knowledge, Skill and Attitude). Overall, project manager competency has strong effect on project success, which means that high project manager competency is likely to bring about higher level of project success. Though the research findings are valuable, limitations in terms of a case of one company only and the use of just some variables may increase risk of respondent bias. Future studies, in order to avoid these limitations, can extend their scope to include a number and range of organizations and more competency variables