This research was done to find out the correlation between students’ motivation and their vocabulary mastery. The subjects of this research were 60 students of second year students of SMA Al-Azhar 3 Bandar Lampung in academic year 2018/2019. Motivation questionnaire and vocabulary test were administered as the instruments to measure students’ motivation level and vocabulary mastery. The data were analysed by using Pearson Product Moment Correlation in SPSS version 16.0. From the test results obtained of this study, the results show that the coefficient correlation between students’ motivation and their vocabulary mastery is 0.690 at the significant level of 0.01. The coefficient correlation is higher than the critical value of r table (0.6900.325). According to the research that has been done, it can be concluded that there was a correlation between students’ motivation and their vocabulary mastery, and the research question of this research has been answered clearly. Keywords: correlation, motivation, vocabulary mastery
                        
                        
                        
                        
                            
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