Grand Prix of Indianapolis

Events in the NTT IndyCar Series have been held annually at the Indianapolis Motor Speedway Road Course in Speedway, Indiana since 2014. Events are known as the IndyCar Grand Prix and the Grand Prix of Indianapolis.

The addition of the Grand Prix of Indianapolis established two Indy car races in the Indianapolis area. It was the first time since 1970 that multiple Championship/Indy car races are being held in the greater Indianapolis area. Through 1970, the Indy 500 was accompanied by the Hoosier Hundred at the Indiana State Fairgrounds, which at the time was a National Championship event. The Hoosier Grand Prix at Indianapolis Raceway Park was held as a USAC Champ Car race from 1965 to 1970.

When the Indianapolis Motor Speedway was under construction in 1909, the original plans included a combined road course layout. This would have allowed for both oval track and road course events. According to historian Donald Davidson, some initial grading appears to have been completed for what would have been a 5-mile layout, but plans for the road course were scrapped during construction. It was not until 1998 that plans for a road course layout at the facility were revived, when the United States Grand Prix was announced.

In 1990, a street circuit in downtown Indianapolis was proposed, with a goal of attracting a Formula One or CART Indy car race. The layout encompassed roads near the Hoosier Dome and Indianapolis Zoo. The plan never materialized.

The 2020 season marked four races were held in Indianapolis, with the three road course events –one during the NASCAR and two during the Intercontinental GT Challenge meeting– as a result of pandemic-related postponements. For 2021, the two races are held during the Month of May and the NASCAR weekend.

The Sonsio Grand Prix is an IndyCar Series race held on the combined road course at the Indianapolis Motor Speedway in Speedway, Indiana. The race was first held in 2014 and is typically held on a Saturday in mid-May, two weekends prior to the Indianapolis 500. The race serves as a lead-in to the Indianapolis 500, and includes support races from the Road to Indy, including Indy NXT, USF Pro 2000 Championship and USF2000 Championship.

The race is run on a newer, modified layout of the circuit previously used for the Formula One United States Grand Prix, and later the Moto GP motorcycle event.

In 2012, Hulman & Co., then parent company of the Indianapolis Motor Speedway, hired Boston Consulting Group to evaluate its business operations. In their report, one of their suggestions was to explore the possibility of hosting an IndyCar Series race on the road course at Indy. The modern FIA Grade One infield road course had opened in 2000, and was initially used for the United States Grand Prix from 2000 to 2007. Later, it was used for Moto GP, and Grand Am. The layout for the infield road course was originally designed in 1992 by Kevin Forbes during the reconstruction of the Brickyard Crossing golf course. It had already gone through some various improvements, most notably in 2008 when the "Snake Pit" segment was added in the infield of oval turn one. Indy cars had never raced on the road course layout, sticking only to the oval circuit for the Indianapolis 500, but their support series, the Indy Lights, had raced there four times. Occasionally Indy cars used the Indianapolis road course as a test facility, since many teams are headquartered in the Indianapolis area. Dan Wheldon notably tested the DW12 chassis at the course in September 2011.