This study investigated cross-lagged associations between parental trust in a child's teacher and children's academic interest across Grades 1-4 in primary school. Parents rated trust in their child's teacher, and 576 children reported their interest in reading and math at each grade. The results showed that high parental trust in a child's teacher predicted the child's high interest in math. In addition, the child's high interest in reading in Grade 2 was related to the father's subsequent trust in the teacher.