This article analyzes the famous soliloquies in Shakespeare’s play Hamlet through the concept of ideational function in Halliday’s systemic functional grammar theory. The focus is on how this theory reveals the deep structure of the text and the complex psychology of the characters, particularly through six processes of ideational function. The analysis demonstrates that these processes not only enhance the understanding of Hamlet’s inner conflicts but also highlight the philosophical reflections embedded in the text. The article emphasizes that while systemic functional grammar theory provides rich perspectives and profound insights for literary text analysis. Overall, this theory offers a structured analytical framework for understanding Hamlet and deepens the appreciation of this classic text.