The Indianapolis Public Transportation Corporation, branded as IndyGo, is a public transit agency and municipal corporation of the City of Indianapolis in the U.S. state of Indiana. It operates fixed-route buses, bus rapid transit, microtransit, and paratransit services.

IndyGo has managed and operated the city's public bus transit system since 1975. In 2024, the system had a ridership of 7,133,100, or about 22,500 per weekday as of the second quarter of 2025.

Indianapolis had a streetcar system that was established in 1854 and operated by various private companies until it was consolidated under the Indianapolis Street Railway Company in 1899 and later Indianapolis Railways in 1932. The final streetcar ran on January 10, 1953, and was replaced by a system of trolleybuses that operated from 1946 to 1957. Streetcar operator Indianapolis Transit System transitioned to motor coaches that followed the same routes as used by the streetcars. The city of Indianapolis took over public transportation in 1975 and established the Indianapolis Public Transportation Corporation to administer bus services. The corporation originally operated buses under the name Metro Bus; the IndyGo name was adopted on November 11, 1996. Portions of the system were briefly privatized in the 1990s, but the move proved unpopular, and all operations were ultimately taken over by the city.

IndyGo has seen a near-constant trend of decreasing ridership since the 1970s and continues to explore options for revitalization. "Express" bus routes were used in the 1980s as an attempt to gain more middle-class riders from outlying areas, but the routes were largely discontinued by the early 2000s.^{[needs update]}

The Blue Line downtown circulator route was added in 2005 to attract passengers and saw considerable ridership. In late 2006, IndyGo complemented the Blue Line with the introduction of the Red Line, which ran between the Indiana University–Purdue University Indianapolis campus and downtown with 15-minute frequency. The Blue Line's ridership declined as federal funding allotted for the route ran out, and the route was discontinued after December 31, 2007. The Red Line remained a free route until January 2009, at which time it became a regularly priced route. The Red Line was retired when the Downtown Transit Center opened, with IUPUI service being covered by Routes 3, 10, and 37, along with 15-minute frequency on Michigan and New York streets.

In the fall of 2007, IndyGo introduced an express route operated by a contractor, using ADA-accessible MCI J4500 motor coaches. The route ran from downtown to the northern suburb of Fishers in Hamilton County, the most populous suburban county of Indianapolis. In March 2008, an additional express route to Carmel (also in Hamilton County) was launched, followed in March 2009 by express service to Greenwood, a southern suburb in Johnson County. These ICE Express Routes to Greenwood, Fishers, and Carmel were discontinued in 2010 after their federal grants expired.

The Green Line, an express bus between downtown and Indianapolis International Airport, was also begun in 2007. It ceased operation on September 16, 2012, due to the expiration of the federal grant funding it, leaving local Route 8 to serve the airport.

Indy Connect is a $1.2 billion plan to create a network of bus rapid transit lines, bikeways, and walkways. In 2017, City-County Council approved a voter referendum increasing Marion County's income tax to help fund IndyGo's first major system expansion since its 1975 founding. Local taxes and federal grants are funding systemwide improvements, including the creation of three bus rapid transit lines, battery electric buses, sidewalks, bus shelters, extended hours, and weekend schedules.