Widespread media reports of local teacher shortages have become a hot topic in education since the summer of 2015. To date, there has not yet been a detailed national analysis of the sources and extent of teacher shortages, or a prognosis for the future. This report details the outcomes of such a study, which analyzes evidence of teacher shortages, as well as national and regional trends in teacher supply and demand. Using several federal databases, the authors examine the current context and model projections of future trends under several different assumptions about factors influencing supply and demand, including new entrants, re-entrants, projected hires, and attrition rates. The authors also investigate policy strategies that might mitigate these effects based on research about effective approaches to recruitment and retention. [For the research brief, see ED606665.]