Academic integrity is a vital pedagogical responsibility that educational institutions should explicitly address. One of the best ways to uphold academic integrity is to create a culture of academic integrity throughout the school. This is especially imperative at high schools where students develop their moral identity because students who act dishonestly at high school will likely behave accordingly in post-secondary education and ultimately be dishonest in familial and professional settings. Creating a culture of academic integrity is a challenging, long and multifaceted journey. In this respect, this exploratory case study set out to create a culture of academic integrity at a high school in Türkiye and explore what facilitates and impedes the process. We followed Stephens' (2016) Multilevel Intervention Model and implemented a School-Wide Education program to guide us through the process. We conducted various activities throughout one academic year, from seminars to competitions. At the end of the term, we conducted individual and focus group interviews with the members of the school community and analyzed the interview data to identify facilitators and barriers of the process. The analysis yielded five facilitators (1) creating buy-in, (2) administrative embracement and support, (3) activities that promote student involvement, (4) external expert and school collaboration as praxis, and (5) policy as the blueprint and five barriers (1) deficiencies in responding academic misconduct, (2) prioritization of academic success over academic integrity, (3) teacher resistance against change, (4) exam-based assessment design, and (5) timing of the activities. Each theme was discussed in detail, and recommendations were made for high schools which set out on a journey of creating academic integrity culture.