This study was designed to investigate whether teacher literacy content knowledge affects student achievement in Texas schools. Teacher participants from Texas public schools completed a three-part survey. In Parts 1 and 2, teachers completed a demographic section and teacher knowledge of foundational reading skills. The survey consisted of questions from The Basic Language Constructs Survey, Teacher Knowledge Assessment: Structure of Language, and Teacher Knowledge of Reading Comprehension (Binks-Cantrell, Malatesha Joshi et al., 2012; Hudson, 2021; Mather et al., 2001). In the final section teachers self-reported class averages by performance level on third-grade reading State of Texas Assessments of Academic Readiness (STAAR; Texas Education Agency, 2023b), kindergarten through second-grade Northwest Evaluation Association's Measures of Academic Progress (NWEA MAP; NWEA, 2019) and Dynamic Indicators of Basic Literacy Skills (DIBELS) mCLASS (University of Oregon, 2018). Data were collected from 105 kindergarten through third-grade reading teachers that completed the Texas Reading Academy (Texas Education Agency, 2022b). Descriptive statistics were compiled for all teacher respondents. Data were analyzed using a Pearson's "r" correlation. The results of this study showed statistical significance of teacher knowledge scores on student achievement at master's level on STAAR and High Average level on NWEA MAP. There was a negative linear relationship between teacher knowledge scores and percentages of students who scored at master's level on STAAR and High Average level on NWEA MAP. However, the information derived from the literature review does not show a negative correlation between teacher literacy knowledge and student achievement. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]