This study examined the application of Lesson Study for professional development (PD) for a domain approach to moral education. A comparison was drawn between the effects of Lesson Study with 17 teachers and 144 students representing middle schools in the same district as a prior study employing intensive traditional PD. In Lesson Study, groups of same grade teachers construct lessons taught by one group member and observed by the others. Teachers meet following the lesson to critique and improve the lesson using criteria established by teachers and informed by outside 'experts.' Findings from analysis of teacher discourse over nine months and end of year surveys revealed improvements in teacher pedagogy, knowledge of moral development, greater sense of professionalism, and efficacy for engagement in moral education in comparison with controls. Fewer lessons were produced, resulting in fewer gains in student moral and conventional reasoning than observed with intensive individualized PD.