In this study, English pronunciation competence refers to the knowledge to perform pronunciation through the word stress assignment. Specifically, the study has two main objectives: (1) to assess Thai learners’ knowledge with regard to word stress assignment, and (2) to determine possible factors contributing to these learners’ pronunciation competence. More specifically, this study attempted to answer the following questions: 1. What is the level of Thai learners’ English pronunciation competence? 2. What is the relationship between three factors: gender, faculty and experiences in studying English, and their knowledge with regard to word stress assignment?