Zach Dempsey is a fictional character from the Netflix series 13 Reasons Why. He is portrayed by actor Ross Butler and is known for being a popular student at Liberty High School. Zach is depicted as a member of the school's basketball team and is often seen as a supportive friend to his peers. Throughout the series, Zach struggles with his own personal issues while trying to navigate the complexities of high school life. His character plays a significant role in the story, particularly in relation to the themes of friendship, loyalty, and the impact of bullying on students.