The New Delta Wastewater Treatment Plant () is a wastewater treatment plant in El Dabaa, Matrouh Governorate, Egypt. It is the world's largest wastewater treatment plant.
The construction of the plant was completed in June 2023. The construction lasted for 24 months.
The plant was designed by Elnabarawy Consulting architectural firm. The plant spans over an area of 32 hectares.
The plant has a water processing capacity of 7.5 million m<sup>3</sup> per day. It is the world's largest wastewater treatment plant.
The plant was constructed at a cost of US$522 million.