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In theory, teacher knowledge predicts instructional practice, thus impacting student outcomes. When it comes to knowledge to teach elementary-grade reading, most previous surveys have focused on knowledge essential for word reading development; few surveys have provided a picture of educator knowledge to teach both word reading and language comprehension. This article describes the development and validation of the Teacher Understanding of Literacy Constructs and Evidence-Based Instructional Practices (TULIP) survey, which assesses teacher knowledge in the domains of (a) phonological awareness, (b) phonics, decoding, and encoding, (c) reading fluency, (d) oral language, and (e) reading comprehension. The TULIP survey was created using an iterative development process involving a systematic review of research, expert review of items, field testing, and a pilot study. A validation study of the resulting TULIP survey was conducted with a sample of 313 in-service elementary-grade teachers of reading. Confirmatory factor analyses revealed that both one-factor and five-factor models of the survey had acceptable fit. The overall TULIP scale had good reliability, and subscales representing knowledge within specific literacy domains had acceptable reliability (with the oral language subscale having lower reliability than the other four subscales). Knowledge overall and within each literacy domain was significantly related to education level, such that teachers with more education had higher scores.