In this research synthesis, a total of 313 studies on English learning motivation published in South Korea from 2000 to 2017 were reviewed. The data were categorized into four criteria: publication year, research method, participant, and research topic. First, the annual trend clearly demonstrated that the number of motivation research showed a steady growth. The dominant research method was quantitative (207 papers) over qualitative (40 papers) and mixed methods (48 papers). University students (157 papers) were major population in English learning motivation research followed by junior high (36 papers), elementary (30 papers), high school students (30 papers), research synthesis (17 papers), and kindergarten students (3 papers). Most research focused on identifying specific subcomponents of English learning motivation in a particular research context. The study suggests that future research needs to focus more on diverse student group such as home-schoolers. Also, the use of research synthesis needs to be encouraged in order to capture the complex nature of English learning motivation.