The purpose of this study was to investigate the effects of guided reading on learners’ self-regulated reading ability. Guided reading is a teaching method that gives learners the opportunity to practice their own reading strategies. Eventually, learners become able to generate their self-regulated reading strategies. Guided reading is based on the gradual release of responsibility model (GRRM), which is closely related to the process of gaining an apprenticeship in constructivism. In order to study the effects of guided reading on learners’ self-regulated reading ability, two classes of 5th graders in a primary school in Seoul participated in this study. One class received guided reading instruction to practice their English reading strategies and the other class received English reading instruction according to the seventh English curriculum in Korea. The results of this study showed that the experimental group who received guided reading instruction based on GRRM achieved a higher score in the post test than the control group who did not receive guided reading instruction. They also showed more confidence in reading English.