Millennium City may refer to:
- Millennium City, Hong Kong, a group of buildings in Hong Kong
- Millenium City, a shopping and residential complex focused on the Millennium Tower in Austria
- The nickname of Gurugram, a city in State of Haryana in India
- The nickname of Cuttack, a city in Odisha state of India
- The nickname of DeCordova, Texas, a city in Hood County, Texas
- Three cities awarded City status in the United Kingdom in the year 2000:
- A setting in the role playing games Champions and Champions Online
- Millennium City incident, a scandal that occurred in Sri Lanka in 2002