Earlier, police said the body appeared to be of an African national.
The man was later identified as British citizen Rodick Andrew Reymond, in his 40s.
The plastic sack containing the body was spotted by passers-by in Nizamuddin area of south Delhi Sunday.
“The highly decomposed body was stuffed in a plastic sack. It had head injuries, and the hands and legs were tied,” said a police officer.
Reymond was identified on the basis of a passport found in his pocket.
Police said the body was taken to a hospital and a case of murder has been registered. The British embassy has also been informed about the case.