This article reviews the evidence for between-session homework (BSH) in individual psychotherapy. Whereas previous reviews have demonstrated a positive association between-client compliance with BSH and distal treatment outcomes; here, we pay particular attention to therapist behaviors that may promote client engagement with BSH assessed as immediate (in-session) and intermediate (session-to-session) outcomes, and moderators of these effects. For our systematic review, we identified 25 studies with 1,304 clients and 118 therapists, mostly on cognitive behavioral therapy such as exposure-based treatments with depression and anxiety disorders. A box score approach was utilized to summarize findings. Results for immediate outcomes were mixed but neutral. Results for intermediate outcomes were positive. Presenting a convincing rationale, being flexible in collaboratively designing, planning, and reviewing homework tasks in accordance with the clients’ goals, aligning BSH with the clients’ takeaways from the session and providing a written summary of homework and rationale, are some therapist behaviors that can promote client engagement with BSH. We conclude with research limitations, training implications, and therapeutic practices.