Phraseological units represent an essential component of linguistic expression in literary discourse. They contribute to stylistic richness, emotional intensity, and the authenticity of communication in fictional narratives. The works of the contemporary American novelist John Green are notable for their expressive language and realistic dialogue, especially in novels aimed at young adult audiences. This article investigates the use of phraseological units in selected works by John Green, including The Fault in Our Stars, Looking for Alaska, and Paper Towns. The study examines the semantic, stylistic, and communicative roles of phraseological expressions in these texts. The results demonstrate that idiomatic expressions, metaphorical phraseological units, and colloquial fixed combinations are frequently used to enhance narrative realism and emotional expressiveness.