The problem of adolescent reproductive health (ARH) in Indonesia is worrying, especially regarding the Triad Adolescent Reproductive Health (Triad ARH) behavior. Many factors influence ARH behavior. This cross-sectional study explores the association factors between demographic factors, knowledge, and attitudes toward ARH behavior. Six hundred and sixty-eight junior high school and senior high school students were randomly selected from five public schools in Bandung Regency, West Java, Indonesia. The questionnaire used in this study consisted of four parts, namely: (1) demographic data of respondents; (2) knowledge including 20 questions used multiple choice questions; (3) attitude with 12 questions measured using the Likert scale; and (4) behaviors with seven questions measured using Likert scale. Results showed that gender (p = 0.006), age (p = 0.031), and level of education (p = 0.006) were associated with behavior toward ARH behavior, but knowledge (p = 0.582), religion (p = 0.628), ethnic (p = 0.276), and attitude (p = 0.094) were not associated with ARH behavior. Multivariate analysis showed that only gender (p
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