Reader response theory offers a dynamic approach to understanding literary interpretation, shifting focus from text-centered analysis to reader engagement. This study investigates reader responses to Diana Wynne Jones's "Howl's Moving Castle" through an analysis of reviews on Goodreads, utilizing Beach's framework of reader-response theory. Employing a qualitative descriptive method, the research collected 60 reader comments, systematically sampling one review per month over the past year. The analysis categorized responses across five dimensions: textual, experiential, psychological, social, and cultural, revealing that experiential responses (33.33%) and textual responses (27.08%) predominated. Additionally, the study examined reader engagement across cognitive (50%), emotional (36.4%), and behavioral (13.6%) dimensions. Findings demonstrate how online reading communities like Goodreads transform literary interpretation from a solitary to a collaborative experience, highlighting the complex ways readers interact with literary texts. By exploring the nuanced responses to "Howl's Moving Castle," this research contributes to our understanding of contemporary reading practices, critical thinking literacy, and the evolving landscape of digital literary engagement.