The purpose of the study was to investigate the effectiveness of Morphological Analysis technique in teaching vocabulary at SMPN 13 Kota Tangerang Selatan, Banten. The design of the study was quasi-experimental. The samples were 76 students of the 8th grade who were taken randomly using purposive random sampling. The samples were classified into two groups: 39 students in the experimental group and 37 in the control one. The data collected through a pretest and a posttest which had been proved valid and reliable by ANATES. In between, the teaching of 20 prefixes and 20 suffixes were done in both groups but with a higher frequency of occurrence in the experimental class. The finding showed that the experimental group got a higher mean score than the control one, and the statistical calculation found that there was a significant difference between the mean scores of the two groups. It indicated that the morphological analysis technique is effective to teach vocabulary to the 8th-grade students of SMPN 13 Kota Tangerang Selatan, Banten.