Teacher sense of academic optimism is individual teachers' beliefs that they can teach effectively, their students can learn, and parents will support them so the teacher can press hard for learning. This new construct is grounded in the social cognitive and self-efficacy theories, social capital theory, work on school culture and climate and research on learned optimism. At the school level, collective academic optimism has been related to academic performance (Hoy, Tarter, & Woolfolk Hoy, 2006b). The analyses tested and supported the validity and reliability of the construct at the individual level with elementary school teachers in a confirmatory factor analysis using Structural Equation Modeling (SEM). (Contains 3 tables and 3 figures.)