This article examines major risk factors for suicide among sexual minority youth using Bronfenbrenner's ecological systems theory. Although suicidal behavior among sexual minority youth is a major public concern in the United States, understanding of this phenomenon has been limited since the majority of empirical research studies have addressed individual level characteristics without much consideration to the larger environmental contexts. This review integrates past and current empirical findings on suicidal behaviors of sexual minority youth within the context of "micro-", "meso-", "exo-", "macro-", and "chrono-"systems levels. Finally, it draws implications for assessment, prevention, and intervention strategies.