One of the most crucial elements of learning English is the ability to communicate effectively. It helps the user to convey information orally in a way that listeners can comprehend. It is important to communicate successfully in this global environment and speaking is considered the most critical of the four language skills. The focus of this study is to identify the highly utilized language learning strategies (LLS) among Form 4 ESL learners to improve their speaking skills. 60 students were selected using the purposive sampling method with ages ranging from sixteen to seventeen years old. Oxford (1990) Strategy Inventory for Language Learning (SILL) Version 7.0 was used as the basis of the questionnaire. The modified version consisted of 36 statements on a Likert scale of 1 to 5. The mean and percentages of each strategy was analysed using SPSS Version 26. The results revealed that metacognitive strategy is the highly used LLS, while the memory related strategy is the minimally used LLS among upper secondary ESL learners in improving their speaking skills. These findings provide useful information for other researchers who are interested in analysing the language learning strategies used by students to improve their speaking skills.