This study aims to investigate the importance and performance of personalized teaching strategies recognized by middle school teachers, analyze their professional development needs, identify the priorities, and provide implications for designing teacher professional development programs. An online survey was distributed to an online community for middle school teachers, measuring the perceived importance and actual performance of personalized teaching strategies. One hundred twenty-one middle school teachers across the country responded to the survey. Thirteen among them (top 11%) who showed high social desirability bias were excluded, and statistical analysis was performed on a total of 108 teachers. For data analysis, dependent sample t-tests, Borich needs analysis, and Locus for Focus model analysis were conducted to derive the professional development needs score, followed by identifying the highest priority and next priority items. As a result, there was a significant difference in the importance and performance level of personalized teaching strategies for all areas and items. In all areas and items of the personalized teaching strategy, the degree of importance was higher than the performance, and the priority of the personalized teaching strategy was high in the order of competency-based learning and learner profile management. Based on the results, we provide implications for designing a teacher professional development program to support personalized teaching strategies.