Mobile learning for English Language Teaching (ELT) has become an emerging trend to sustain education, providing the option to learn English for Specific Purposes (ESP). However, the review of mobile learning in ESP is scarce, despite its importance in sustaining education. Thus, this review systematically identifies the trends of mobile learning concerning ESP. Using three databases, namely Web of Science (WoS), Scopus, and Educational Resources Information Centre (ERIC), 28 articles were extracted out of 139, from 2012 to 2021, with exclusion and inclusion criteria taken into consideration. First, the significant findings portrayed that mobile apps are the most commonly used means of mobile learning. Second, vocabulary and language competency is more emphasised in mobile learning for ESP. Third, mobile learning in ESP mostly dominated the business field of studies. These three findings implied that there are still gaps in research on mobile learning and ESP. Generally, this review is valuable for practitioners to know which mobile learning tool is ready to be used and in identifying gaps for research in mobile learning and ESP, to sustain education for the future.