The purpose of this research is to explain the effectiveness of using Dawn of Civilization application to enrich students’ vocabulary for speaking proficiency. This study employed quantitative method. The research design was pre-experimental research, one-group pre-test and post-test design. The research participants were 27 the ninth graders at SMP Negeri 35 Semarang. Data collection technique used pre-test design, post-test design, and documentation. Data analysis technique applied t-test formula SPSS 22 version program. The experimental class was taught with Dawn of Civilization application. This research instruments were speaking test and quiz, and the scoring rubric for speaking and quiz were used to evaluate the students’ speaking and vocabulary on the pre-test and post-test. The mean post-test of experimental class, 79.33 is higher than that of pre-test of experimental class namely 64.44. The results of the study show that Dawn of Civilization application is an effective application in students’ vocabulary for speaking proficiency.