The use of technology in learning vocabulary can be regarded as a tool assisting English language learning. This study investigated the use of mind mapping software in learning vocabulary among English as foreign language (EFL) learners. In doing so, 62 learners were selected based on a Language Placement test. Then they were randomly divided into two experimental and control groups. The experimental group received vocabulary instruction in the passages of the learners' textbooks and several mind maps were used in the class. Twelve passages including their new words were covered in 12 sessions. The control group received traditional method of reviewing the definitions, using the dictionary, and teachers' explanation. After treatment sessions, they took the post-test of vocabulary designed based on the reading passages. Independent and paired samples t-test were used to compare learners' means of pre and posttests. findings revealed that the learners who used the mind mapping software could perform better than the control group at the significant level. Implications of the study suggest learning vocabulary can be boosted if effective software like mind mapping used in teaching processes.