This study aimed to improve English listening skills of 40 high school students in Thailand through the use of Dictogloss approach. Dictogloss is a technique where students listen to a passage and work together to reconstruct it from memory. The study found that (1) while Dictogloss improved listening skills, the effectiveness did not meet the 70% criterion; (2) Dictogloss activities had an effectiveness of 72.25%; and (3) post-test scores were significantly higher than pre-test scores, showing Dictogloss improved listening. The study concluded that Dictogloss and cooperative learning can effectively improve students' English listening abilities.