Pronunciation plays a significant role in English teaching and learning around the world and this particular field has received much attention from several scholars. The study was conducted to investigate common mistakes made by Vietnamese university learners while pronouncing English consonant clusters. This is a quantitative study with the participation of 39 English as a Foreign Language (EFL) learners. To collect data for the study, a pronunciation test was employed. The results show that the common mistakes made by the learners varied, depending on the types of consonant clusters. Specifically, clusters containing voiceless plosives led to the highest mispronunciation. There was also a tendency to simplify the complex clusters of three-consonant by deleting the first, second consonant, or in some cases, both. Accordingly, this study suggests pedagogical implications for teachers and learners in similar contexts in Vietnam in acquiring the pronunciation of English.