This qualitative case study aimed to construct an understanding of academic writing of culturally diverse adolescent undergraduate students in relation to their cultural and linguistic identities. The study focused on five participants. All the participants were between 18 and 22 years old, and they varied in academic standing. The participants' countries of origin were India, Nigeria, and the United States. The American participants were from Latin and South Asian cultural backgrounds. I performed three semi-structured interviews with each participant to gather data. I also collected two writing assignments from each participant, an assignment that participants liked writing, and another they disliked writing. My own experience of an international student inspired me to conduct a study that might be helpful for all the students who are culturally diverse. My own struggles in academic writing motivated me to understand the writing of other diverse students.