The aim of this study is to examine 8th grade students' Van Hiele geometry thinking levels, proof writing and justification skills. The research was carried out with sixteen eighth grade students of a private school in Sivas. Participants were selected based on an easily accessible sample. The data were collected from the students who participated in the face-to-face teaching process in their schools and volunteered to participate in the research on the data collection day in the fall semester of the 2020-2021 academic year. The data collection tool is the Van Hile geometry test and the geometry proofing test. The document analysis method was adopted in the study. While analyzing geometry proof writing and justification test data, geometry proof writing test evaluation rubric and justification evaluation rubric were used. As a result of the analysis of the data obtained, there was a linear relationship between the students' Van Hiele thinking levels and their proof writing skills, while there was no positive relationship between their justification skills and their Van Hiele thinking levels and their proof writing skills. [Note: The publication year (2022) shown on the PDF is incorrect. The correct publication year for this article is 2023.]