The Editors are pleased to announce that Health Psychology has adopted the Transparency and Openness Promotion (TOP) Guidelines (Center for Open Science, 2021). We and the other core American Psychological Association (APA) journals are implementing these guidelines at the direction of the APA Publications and Communications Board. Their decision was made with the support of the APA Council of Editors and the APA Open Science and Methodology Committee. The TOP Guidelines were originally published in Science (Nosek et al. 2015) to encourage journals to incentivize open research practices. They are being implemented by a wide range of scientific publications, including some of the leading behavioral and medical research journals. The TOP guidelines for Health Psychology are outlined in our recently revised Instructions to Authors. We are implementing most of the standards at TOP Level 1, which means that adherence is required. We are implementing other standards at Level 2, which means that authors are encouraged to adhere to them and required to disclose whether and how they have done so. (PsycInfo Database Record (c) 2021 APA, all rights reserved)