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The J Line (formerly the Silver Line, sometimes listed as Line 910/950) is a 38 mi bus rapid transit route that runs between El Monte, Downtown Los Angeles and Gardena, with some trips continuing to San Pedro. It is one of the two lines in the Metro Busway system and is operated by the Los Angeles County Metropolitan Transportation Authority (Metro).

The J Line offers frequent, all-stops service along the El Monte Busway and the Harbor Transitway, two grade-separated transit facilities built into the Southern California freeway system. The line was created on December 13, 2009, as part of the conversion of the facilities from high-occupancy vehicle lanes into high-occupancy toll lanes (branded as Metro ExpressLanes) that allow solo drivers to pay a toll to use lanes. The tolls collected have been used to operate the J Line and to refurbish the aging stations along the line.

As J Line buses travel along the El Monte Busway and the Harbor Transitway they serve stations built into the center or side of the roadway. There is a 3.6 mi gap between the western end of El Monte Busway and the northern end of the Harbor Transitway in Downtown Los Angeles, where J Line buses travel on surface streets, making a limited number of stops. Along the route, buses serve several of the region's major transportation hubs including El Monte Station, Union Station, 7th Street/Metro Center station, Harbor Freeway station and the Harbor Gateway Transit Center.

In 2020, the line was renamed from Silver Line to the J Line while retaining its route numbers and the color silver in its square icon as part of a renaming of all Metro lines.