This study aims at examining the relationship between personality traits and the willingness to communicate in a second language. A sample of 50 students majoring in English as a second language at Jordan University of Science and Technology (JUST) was surveyed using a questionnaire to collect the data. Personality traits were measured by the 50- item version of Goldberg‟s [1] international personality traits, while the willingness to communicate in a second language was measured using the scale of MaCrosky and Richmond [2]. The findings show that the university students perceived their personalities as being somehow balanced where the grand mean of the 50 items measuring personality traits was 3.1 on a 5- point Likert scale ranging from 1 to 5. As for the willingness to communicate, the students perceived their overall level as being moderate, where the grand mean of the 20 items measuring their willingness to communicate was 61 on a scale ranging from 0 to 100. However, the willingness to communicate in a second language with friends and acquaintances was found to be very high, while it was found low with strangers. In regard to the relationship between personality traits and the willingness to communicate in a second language, the findings show that there are significant positive correlations between three of the Big Five Personality Traits (i.e. extraversion, agreeableness, and openness) and the willingness to communicate in a second language. However, the findings do not show significant correlations between the other two personality traits (i.e. neuroticism and conscientiousness) and the willingness to communicate. The study concluded with the argument that the realization of the nature of the personality traits and the willingness to communicate in a second language may have important theoretical and practical implications for linguistics, teachers and learners.