The Ngwa (Ṅgwà ), an Igbo group, constitute the largest and most populous sub-ethnicity, or clan, in southeastern Nigeria. They occupy an area of about , although some accounts read at least . In 1979, their population was held at an estimate of approximately 1.5 million people. Their ethnonym Ngwa is used to describe the people, their indigenous territory, and their native tongue. King Josaiah Ndubuisi Wachuku, who died on Friday 2 June 1950, was Eze, paramount chief and servant leader head of Ngwa people during British colonial times.

The National Ground Water Association (NGWA), headquartered in Westerville, Ohio, is a membership-based nonprofit organization.