Across the nation, teacher shortages are receiving broad attention. Teacher turnover can lead to negative outcomes for students through the replacement of effective teachers by inexperienced or unqualified teachers, increases in class sizes, or reductions in course offerings. For educators, frequent turnover upsets collaboration, stability, relational trust, and institutional knowledge. In addition, the financial cost of replacing a teacher has been estimated to be as high as $20,000 for urban districts, putting extra strain on districts with limited resources who must absorb the cost of teacher attrition. Effectively targeting efforts to address shortages requires knowledge of how patterns of teacher mobility, attrition, and retention vary across different types of districts, geographic areas, subject areas, and teachers' levels of effectiveness. Using a snapshot in time between the 2017-18 and 2018-19 school years, this report looks into the retention, movement, and attrition of Tennessee's public school teachers. Tennessee's teacher retention rate is similar to other states, but further analyses suggest that while urban areas require support retaining teachers, efforts to combat high-needs subject shortages should focus on recruiting more teachers into those fields.