The lack of a standardized nomenclature for suicide-related thoughts and behaviors prompted the Centers for Disease Control and Prevention, with the Veterans Integrated Service Network 19 Mental Illness Research Education and Clinical Center, to create the Self-Directed Violence Classification System (SDVCS). SDVCS has been adopted by the Department of Veterans Affairs and the Department of Defense. Another classification system, the Columbia Classification Algorithm for Suicide Assessment, has been recommended by the Food and Drug Administration. To facilitate the use of both systems, this article provides a "crosswalk" between the two classification systems. (Contains 3 tables.)