The purpose of this study was to explore the impact of the lesson study (LS) approach on developing knowledge and perception of peer mentoring (PM) and communities of practice (CoPs) among kindergarten (K.G.) teachers in Egypt. It also aimed to improve students' learning in science concepts and English vocabulary due to teachers' participation in LS. A mixed methods design was employed. Results show that the LS approach provided a rich context for practicing PM experiences and helped teachers to collaborate in a CoP. Further gains were also achieved regarding students’ learning. •Effects of LS on PM and CoP among teachers were investigated.•The impact of the activities developed during LS on students' learning was assessed.•The study was composed of two samples: 21 teachers and 246 learners.•Significant results were obtained concerning teachers' knowledge and perceptions of PM and CoP.•Positive effects on students' learning of science and English were also found.

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