| MetroLink |
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| Owner | Bi-State Development Agency |
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| Locale | Greater St. Louis, Missouri–Illinois, U.S. |
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| Transit type | Light rail |
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| Number of lines | 2 |
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| Number of stations | 38
(1 under construction) |
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| Daily ridership | 21,800 (weekdays, Q4 2025) |
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| Annual ridership | 7,665,000 (2025) |
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| Headquarters | One Metropolitan Square
211 North Broadway
St. Louis, Missouri, 63102, U.S. |
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| Website | metrostlouis.org/metrolink |
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| Began operation | July 31, 1993 (1993-07-31) |
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| Operator(s) | Metro Transit |
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| Reporting marks | BSDA |
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| Character | At-grade, below-grade, elevated, subway |
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| Number of vehicles | 75 |
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| Train length | 2 articulated vehicles |
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| Headway | 10–20 minutes |
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| System length | 46 mi (74 km) additional 5.2-mile (8.4 km) under construction |
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| No. of tracks | 2 |
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| Track gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
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| Electrification | Overhead line, 750 V DC |
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| Average speed | 24.7 mph (40 km/h) |
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| Top speed | 65 mph (105 km/h) |
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MetroLink (reporting mark BSDA) (commonly referred to as "Metro") is the light rail system that serves the Greater St. Louis area. It is operated by Metro Transit in a shared fare system with MetroBus. Currently, it is a two-line, 46 mile (74 km) system serving 38 stations operating primarily on separate grade with subway sections in downtown St. Louis and near Forest Park and Washington University in St. Louis.
Unlike the majority of LRT systems in the United States, St. Louis MetroLink shares more characteristics of a rapid transit service, including a largely independent right-of-way, a higher top speed, and level boarding at all platforms. In 2025, the system had an annual ridership of 7,665,000.