This master’s thesis focuses on PUs found in the script of James Cameron’s film Titanic, their classification and analysis. Their proper classification is based on that of Sabine Fielder which she proposes in English Phraseology: A Coursebook (2007), and their analysis is provided with the Longman Dictionary of Contemporary English and the Merriam-Webster Dictionary, on the basis of which a comparison between the definitions of the phraseological units has been made. The thesis therefore consists of two parts: the first is theoretical part providing relevant information on the topic of phraseology, phraseological units, and their categories, using primarily Fiedler’s English Phraseology: A Coursebook (2007) but also incorporating other significant authors and their work. The second part entails application of that theory in the classification of the extracted PUs, and it also shows how the mentioned dictionaries define those PUs. The comparison between the definitions is briefly noted after each category, and the similarities and differences in detail are shown in the section covering results of the research.