The purpose of this research was to find out whether the students' vocabulary mastery can be increased by using Hangman Game or not. This research used pre-experimental research design. The population of this research was the seventh grade students of MTs Negeri Sausu. The sampling technique employed in this research was random sampling. The data were collected by using pre-test and post-test. The data gathered were analyzed statistically. The result of the data shows that the t-counted value (21,93) was greater than the t- table value (1.706) by applying 0.05 level of significance and 26 (27 – 1) degree of freedom (df). It means that the use of Hangman Game can increase students' vocabulary mastery of MTs Negeri Sausu.