In this chapter, we argue that collaboration is integral to critical thinking pedagogies and show how classrooms that foster student thinking enhance the quality of collaborative inquiry outcomes. We demonstrate how explicit cognitive and metacognitive tools, paired with strategic dialogic frameworks such as Accountable Talk, can scaffold students’ ability to share, refine, and justify their ideas, thereby strengthening the quality of thinking and the social dynamics of learning. We also provide practical guidance on sustaining a culture of collaborative thinking through a Teaching for Thinking (T4T) approach, highlighting how dispositions like open-mindedness, integrity, and perseverance grow in environments that normalise critical dialogue, mutual feedback, and purposeful inquiry. Drawing on multiple real-world examples from our ‘Thinking Schools Network,’ we offer strategies for developing students’ collaborative reasoning in ways that transcend disciplinary boundaries.