Recent developments for disseminating and implementing evidence-based practices (EBPs) have emphasized the importance of increasing therapists’ knowledge of such techniques. However, systematic efforts to measure knowledge in therapists serving youth have mostly relied on poorly researched study-specific measures. This study investigated the structure of EBP knowledge in a large sample of youth community therapists (N = 240) via a therapist report instrument emphasizing therapeutic commonalities across various types of treatment approaches. Findings supported a three-factor structure of knowledge with scores on factors varying by therapists’ primary practice setting and education level. The relationships between therapist knowledge of and attitudes towards EBPs are also discussed.