Classrooms are a learning environment for teachers as well as students. Teachers can improve their teaching practices by monitoring and reviewing their practices. An important tool of this development is the reflective thinking of teachers. For teachers, reflection is an opportunity to look into the classroom from the outside, to examine the learning process, and to make inferences for pedagogical development. Video recordings of teachers' lessons can be used to stimulate self-reflection by capturing the details of the teaching process and by examining the classroom atmosphere. This study aims to investigate teachers' opinions about using video-based self-reflection for their pedagogical development. Seven teachers participated in the research. Data were collected through a Pre-interview Protocol, Teachers' Reflection Reports written for twelve weeks about one recorded lesson per week, and a Post-interview Protocol after the 12-week video-based self-reflection period. The main findings show that the teachers' video-based self-reflections constitute nine categories and two weeks video-based self-reflection process resulted in changes in teachers' opinions in terms of reflection on video recording, professional development and teaching and learning process.