This chapter reframes prompt engineering as an ethical and civic design practice, emphasizing its role in shaping inclusion, accessibility, and social equity in AI-mediated interactions. It challenges the assumption of neutrality in prompting, demonstrating how omissions in audience, tone, and context reproduce dominant biases and marginalize diverse perspectives. The discussion introduces ethical prompting as a method of intentional design that centers lived experience, cultural awareness, and communicative responsibility. It examines common bias traps and illustrates how structured prompting can surface and mitigate exclusionary patterns. The chapter extends inclusion beyond demographics to encompass accessibility, neurodiversity, and situational vulnerability, highlighting the need for adaptable, user-centered prompt design. It explores how prompt structure, tone, and format influence cognitive accessibility and emotional safety across diverse user contexts. In public service applications, prompting is positioned as critical infrastructure that directly affects access to rights, services, and civic participation. The CASTROFF framework is applied as a tool for embedding ethical accountability, enabling systematic evaluation, audit, and redesign of prompts. Emphasis is placed on transparency, inclusivity, and the professional responsibility of prompt designers and institutions. Ultimately, the chapter positions inclusive prompting as essential to building equitable, trustworthy, and human-centered AI systems.