The topic of the thesis is Poster art as an incentive for student’s critical thinking, and it is composed of theoretical and practical part. Encouraging and developing critical thinking in children is one of the most important tasks both parents and school institutions where children spend a good part of their time at the beginning of their lives, therefore the educational period is considered to be the basis for overall development and lifelong learning. Well developed critical thinking creates young people who are less passive, more tolerant and empathetic towards the content they are exposed to. At the same time with the acquired knowledge it allows them to read and understand the text and imagines they observe, but still keeping in mind they should not believe everything they see. Critical thinking gives power to children to make right and good decisions in the later years of their lives, those decisions that will have positive outcomes as opposed to negative ones. It creates people who know how to fight for their rights and opinions while respecting the views and opinions of other people. As critical thinking is becoming an essential skill, it is up to educational systems and teachers to find ways to successfully develop it. One of often overlooked ways is trough fine arts. Fine arts, which also includes poster art , are not just about creating beautiful things but a process in which observation, interpretation, decision-making and problem-solving takes place, all of which are key elements of critical thinking. Based on theoretical part the research was conduced with students of the first four grades of Elementary school in the school year 2023/2024. After the research, it was concluded that poster art is one of the ways in which it is possible to encourage critical thinking in students.