The present study examined relationships among critical thinking, writing strategy use, second/foreign language (L2) writing anxiety, and L2 writing performance of Iranian English as a foreign language (EFL) learners. To this end, 100 homogenized EFL learners (57 female learners and 43 male learners) filled out Facione and Facione’ s (1993) California Critical Thinking Skills Test-form B (CCRST), Petric and Czarl’ s (2003) Writing Strategy Questionnaire (WSQ), Cheng’ s (2004) Second Language Writing Anxiety Inventory (SLWAI), and the second task of the academic version of IELTS exam. Multiple correlation analyses revealed a significant positive relationship between L2 writing performance and writing strategy use; and L2 writing performance and critical thinking. Results also revealed a significant negative relationship between L2 writing performance and L2 writing anxiety. Furthermore, it was found that L2 writing anxiety was a stronger predictor of L2 writing performance. Additionally, the results of one-way MANOVA showed a significant difference between Iranian male and female EFL learners regarding both their L2 writing performance and L2 writing anxiety. These results emphasize the inclusion of pre-planned writing sessions for Iranian EFL learners which can help foster critical thinking skills and writing strategy use, reduce L2 writing anxiety and hopefully, improve their L2 writing ability.