The Sultanate of Aceh, officially the Kingdom of Aceh Darussalam (; Jawoë: كاورجاون اچيه دارالسلام), was a Sultanate centred in the modern-day Indonesian province of Aceh. It was a major regional power in the 16th and 17th centuries, before experiencing a long period of decline. Its capital was Kutaraja, the present-day Banda Aceh.