Teachers' professional learning: Do instructional leadership and teacher leadership make a difference in Turkiye?

Numerous studies have explored teachers' professional learning, yet ongoing efforts persist to understand the influence of leadership factors on this concept. This study aims to analyse the relationship between school principals' instructional leadership behaviours, teacher leadership and teachers' professional learning. A structural model was created and tested using data from 346 Turkish teachers. Results confirmed that teacher leadership behaviours mediate the relationship between principals' instructional leadership behaviours and teachers' professional learning. In contexts where principals demonstrate instructional leadership, teachers tend to exhibit more teacher leadership behaviours, fostering positive attitudes towards professional learning. Teachers engaged in teacher leadership behaviours prioritise activities enhancing their professional learning. This study concludes that the impact of instructional leadership on teacher leadership and professional learning hinges on principals' implementation of instructional leadership and teachers' integration of professional learning into their practices, contributing to leadership literature.