This qualitative study examines the experiences of older adults with Empower@Home, an older adult-centered, layperson-supported internet-based cognitive behavioral therapy (iCBT) program for depression, with a focus on engagement-related factors. Adults aged 50 or older with at least mild depressive symptoms were recruited from multiple resources. A random subset of participants was invited for a semi-structured qualitative interview during a post-intervention assessment conducted over the phone (N = 148). Interviews were recorded and transcribed verbatim. Transcripts were coded in a multi-phase, team-based approach utilizing inductive coding techniques, followed by thematic analysis to identify key themes. Six key themes regarding engagement emerged: the importance of a structured, skills-based, and self-paced approach; the essential role of weekly coaching for accountability, web interface's ease of use and accessibility; narrative engagement dynamics; enhanced learning through multimodal instruction; and tailoring challenges in iCBT. Older adult-centered, layperson-supported, and multimodal iCBT can effectively engage older adults in managing their mental health. iCBT programs can be integrated into various community aging settings. By leveraging each setting's strengths and involving a range of professionals, these programs can play an important role in enhancing older adults' mental health.