Learning vocabulary is considered basic in second language learning and yet Korean high school students tend to use a limited range of vocabulary learning strategies. The present study attempts to investigate the relationship between Korean high school students' English vocabulary learning strategies (EVLS) and vocabulary proficiency. For the purpose, a survey was conducted to 113 first grade high school students to find out their vocabulary learning strategies and their relationship with vocabulary proficiency. The results show that the participating students favored simple memorization strategies regardless of the proficiency levels though the higher group used more EVLS than the lower group. Among the five EVLS categories, the meaning-determination strategies were most frequently used while the social strategies was least used. The results suggest that students need to be encouraged to use various vocabulary learning strategies to use words in their productive language.