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| Location | 3075 Clairton Rd. (PA 51) West Mifflin, Pennsylvania 15123 |
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| Coordinates | 40°20′17″N 79°56′38″W / 40.338°N 79.944°W |
| Opening date | Phase I – October 24, 1979 Phase II – March 12, 1980 |
| Closing date | February 16, 2019 |
| Developer | Edward J. DeBartolo Corporation |
| Management | Moonbeam Capital Investments LLC |
| Owner | Moonbeam Capital Investments LLC |
| No. of stores and services | 200 |
| No. of anchor tenants | 6 |
| Total retail floor area | 1,290,000 square feet (120,000 m2) |
| No. of floors | 3 (2 in Sears, JCPenney, Macy's, and Macy's Furniture; 1 in Dick's Sporting Goods and Steve and Barry's) |
| Parking | 6,000 space garage and lot |
| Public transit access |  Port Authority bus: 59, Y1, Y46 |
| Website | centuryiiimall.com (2013 archive) |
Century III Mall was an abandoned enclosed shopping mall located along Route 51 in West Mifflin, Pennsylvania, about 10 miles southeast of downtown Pittsburgh, Pennsylvania, United States. It operated from 1979 to 2019 — a period of almost 40 years.
The mall was built on a former slag dump in 1979. The Century III Mall planning began in 1976, opened in 1979, and closed in 2019. Anchor stores included Kaufmann's, Gimbels, JCPenney, Sears, and Montgomery Ward.
It was the third-largest shopping mall in the world when it opened, but it has since been surpassed by much larger malls. The mall was developed and owned by Edward J. DeBartolo Corporation.[1] A 1996 merger between the mall's developer, now known as the DeBartolo Realty Corporation, and Simon Property Group, brought Century III Mall under the Simon DeBartolo Group heading, who owned the mall until 2011. The vacant mall is owned by Las Vegas-based Moonbeam Capital Investments LLC, which began demolition in 2024.