Students' writing ability has become an essential element for student success and may be influenced by the student and teachers skills; therefore, the subject has garnered the attention of regulators and researchers alike. Thus, the current research investigates the role of student critical thinking skills and teachers' intellectual skills on students' writing ability across private universities in Indonesia. The researchers also investigate the mediating impact of student learning among the nexus of student critical thinking skills, teachers' intellectual skills and student writing ability in the context of private universities in Indonesia. The present study has used primary data collection methods and employs the survey questionnaires for data collection. The current research also use the primary data analysis tools such as smart-PLS to test the study hypotheses as well as the items' validity and reliability. The results reveal that student critical thinking skills and teachers' intellectual skills have a positive influence on student writing ability in private universities in Indonesia. The results also show that student learning significantly mediates between the association of student critical thinking skills, teachers' intellectual skills and student writing ability of private universities in Indonesia. This study is meaningful for future researchers who want to investigate this area in a more in-depth manner in the future and provides the guideline to the regulating and developing authorities while formulting policies related to students' writing ability in the universities of Indonesia.