Professional practice guidelines (PPGs) are intended to promote a high level of professional practice and serve as an educational resource, providing pragmatic guidance in a clinical area for psychologists. Measurement-based care (MBC) is an evidence-based psychological practice with accumulating empirical support and alignment with patient-centered care. In connection with the American Psychological Association's Advisory Committee for Measurement-based Care and the Mental and Behavioral Health Registry, this article outlines various lines of support for the development and implementation of an MBC PPG. In addition to research evidence, we address the demonstrated need of this guideline across three domains: public benefit, professional guidance, and legal and regulatory issues. Consistent with the aspirational spirit of a PPG, this article proposes a draft PPG statement and highlights how an MBC PPG would improve service delivery, facilitate implementation of an evidence-based practice associated with symptom reduction, improved retention, and greater patient satisfaction, as well as create a framework that will better align changes in reimbursement models with patients' and providers' treatment goals. We also identify key future directions and critical gaps in MBC science and implementation that require attention.This document is copyrighted by the American Psychological Association or one of its allied publishers.This article is intended solely for the personal use of the individual user and is not to be disseminated broadly. James F. Boswell https://orcid.org/0000-0001-6214-0787 Vanderbilt University and Susan Douglas receive compensation related to the Peabody Treatment Progress Battery; and Susan Douglas has a financial relationship with MIRAH, and both are measurement-based care (MBC) tools. The author declares a potential conflict of interest. There is a management plan in place at Vanderbilt University to monitor that this potential conflict does not jeopardize the objectivity of Dr. Douglas' research.James F. Boswell played lead role in conceptualization, project administration, supervision, and writing of review and editing and equal role in resources and writing of original draft. Kimberly A. Hepner played lead role in conceptualization, project administration, and supervision and equal role in resources, writing of original draft, and writing of review and editing. Kathleen Lysell played lead role in conceptualization, project administration, and supervision and equal role in resources, writing of original draft, and writing of review and editing. Nan E. Rothrock played supporting role in conceptualization, writing of original draft, and writing of review and editing. Nick Bott played supporting role in conceptualization, writing of original draft, and writing of review and editing. Amber W. Childs played supporting role in conceptualization, writing of original draft, and writing of review and editing. Susan Douglas played supporting role in conceptualization, writing of original draft, and writing...