This study assesses the level of teachers’ participation in decision-making in their schools. Descriptive survey research methodology was adopted and a survey study research design was used as the operational framework for data gathering. Data were collected from three secondary schools in Addis Ababa City Administration, Yeka Sub City. The sample comprised of 141 secondary school teachers and 5 Principals who were randomly selected. In order to get the data for the study, questionnaire for teachers and principals were used. Based on the nature of the basic questions raised and data obtained, different statistical analytical tools were used. In order to determine the level of existing and desired teacher’s participation, a chi square test analysis was applied. And the t-test analysis was applied to determine whether or not there were significant differences between the existing and desired levels of teacher’s participation. One way ANOVA was employed to examine the effect of variables such as sex and qualification on the levels of teacher’s participation in decision making. Rank correlation coefficient was to assess the relationship between the groups of the respondents based on the importance they attached to the six decision categories. In general, this study has revealed that the existing levels of participation of teachers in the school decision making is very low, whereas their desire to participate is relatively found very high. The study established that low teacher participation in critical school issues result in poor governance and low staff motivation to work. This will lead to missing the attainment of schools objectives. The study recommends better empowerment of teachers in decision- making for better school performance. Teachers should be consulted and their opinions gathered in order to encourage them to participate