The main objective of this paper is to analyze the effect of employee Engagement on employee commitment: the case of Heineken Breweries S.C. This study was carried out based data gathered from non-managerial employees who are working at its head office and Kilinto factory which are both located in Addis Ababa. The research approach deployed for the research is quantitative research and Explanatory research design in order to show the causal relationship between employee engagement and employee commitment. The primary data were collected using close ended questionnaires which are adopted from prior literatures. The scope of the research was limited to its head office and Kilinto factory: In the research the major concepts of employee engagement are well articulated in comparison with the three dimensions of employee engagement; affective commitment, continuance commitment, and normative commitment. Employee engagement was measured with 12 standard questions which are adopted from Gallup Work place edit. On the other hand employee commitment was measured using Allen and Meyer standard questionnaires with 6 questions for the each commitment dimensions. All of the data collected from the respondents were analyzed using inferential and descriptive statistics applying a five point Likert scale. The findings of the research suggest employee engagement has a positive causal relationship with affective and normative commitment and negative causal relationship with continuance commitment. It implies that Heineken Breweries needs to increase its engagement level so that employees will be committed and it in turn results in organizational effectiveness and improved performance. It is a reflection that engaged employees can deliver more and companies need to give emphasis for employee engagement and commitment