SUMMARY
The present study investigated the relationships between willingness to communicate (WTC), oral proficiency (OP), ambiguity tolerance (AT), and learner autonomy (LA). The study also investigated whether WTC, AT, LA would predict OP. To those ends, two hundred language learners at Khavaran Cultural Center in Tehran were given three questionnaires, a placement test, and the Preliminary English Test. Convenience sampling was used to select participants in this study, and IBM SPSS STATISTICS (version 21) was run to analyze the data. The results of statistical analyses indicated that there was a strong, positive correlation between WTC and OP. However, the results revealed that there was no statistically significant correlation between WTC and AT. On the other hand, the findings showed that there was a positive statistically significant relationship between WTC and LA. The findings also revealed that there was no statistically significant relationship between OP and AT. However, a positive statistically significant relationship between OP and LA was found. Finally, the results of standard multiple regression showed that WTC was a statistically significant predictor of OP. Implications for language teachers and material developers are discussed.