The purpose of the study was to determine the level of the relationship among Turkish elementary school students' personal epistemologies, motivation, learning strategies, and achievements in science. A total of 322 fifth-grade students participated in the study. Results from the structural equation modeling showed that students' personal epistemologies influence both their motivation and metacognitive strategies in science learning. Viewing scientific knowledge as constructed by the learner contributes to the students having high motivations, high science achievement, and the ability to engage metacognitively in learning tasks.