This study reports on an investigation of the relationships between teacher empowerment and organisational citizenship behaviours. Data were collected from 457 teachers working in secondary schools in the Eastern Province of Saudi Arabia. The results indicated that teacher empowerment was positively correlated with organisational citizenship behaviours among teachers. Regression analysis indicated that teacher empowerment explained 48% of the variance in organisational citizenship behaviour scores. The results of the study revealed that decision making, professional growth, status and impact had the most contribution in explaining the variance of total organisational citizenship behaviours. These results indicated the significance of empowering teachers in the school settings. The more the teachers are empowered, the more they exhibit behaviors that go beyond their traditional roles towards the advantage of their students, colleagues, and schools. Directions for further research are discussed.