The 2025 Firestone Indy NXT Series was the 39th season of the Indy NXT open wheel auto racing series and the 23rd sanctioned by IndyCar, acting as the primary support series for the IndyCar Series. This was the third year of the championship running under the Indy NXT moniker following its acquisition by Penske Entertainment, the owner of the IndyCar Series, in 2022.

Andretti Global driver Dennis Hauger won the Drivers' Championship title with one race to spare, and in doing so also became Rookie of the Year.

All teams used Dallara IL-15 cars with an AER produced Mazda sourced 2.0 litre engine and Firestone tires. The following drivers and teams competed in the series.

The 2025 schedule was announced on June 13, 2024. Indy NXT visited the same twelve locations as the year before.

The 2025 Indy NXT season began with a brilliant debut for Andretti's Dennis Hauger, who broke the track record in qualifying around the Streets of St. Petersburg to claim pole position. He led from the outset of the race, which was interrupted early by multiple crashes leading to three caution periods. Despite pressure from his teammate Lochie Hughes at each restart, Hauger gradually pulled clear after the third interruption ended on lap 24 and established a commanding lead, before a late crash for Abel/Miller Vinatieri Motorsports’ Jack William Miller brought out the pace car, ending the race under caution. Hauger secured victory ahead of Hughes, with HMD Motorsports’ Caio Collet third.

Hauger carried his dominant form into Barber Motorsports Park, taking pole position on a drying track with a lap over half a second clear of the field, while Collet topped the first group to start second. Hauger led from the rolling start but, incidents during the opening part of the race caused two cautions. During that period, Collet encountered throttle problems that dropped him out of contention, leaving Hughes, Abel/Force Indy’s Myles Rowe and HMD’s Evagoras Papasavvas to fight for the remaining podium places. Hauger steadily built a gap of over 11 seconds to win ahead of Papasavvas, who resisted Hughes to finish second on debut. Hauger extended his championship lead to 29 points.

Hughes led qualifying on the Indianapolis Motor Speedway Road Course to secure both pole positions of the weekend. At the start of race one, Hauger’s attempt to take the lead around the outside of turn one ended in contact with Rowe and HMD’s Callum Hedge, sending him off track and dropping him to the back of the field. Collet took advantage to slot into second, while Hughes built an early gap. Two cautions interrupted proceedings, but Hughes managed both restarts and controlled the race throughout, eventually finishing ahead of Collet and Rowe. Hauger recovered to eighth, allowing him to narrowly retain the championship lead by three points over Hughes, with Rowe third.

Hughes once again started from pole position for race two at Indianapolis, with Hauger alongside on the front row. An early caution was triggered by a multi-car clash involving Miller, Andretti’s James Roe, and HMD’s Nolan Allaer, which also delayed Abel’s Jordan Missig and HMD’s Nikita Johnson. On the restart, Hauger made his move on Hughes to take the lead, and although his team-mate stayed close for much of the distance, Hauger gradually edged away to win by almost five seconds. Behind them, Rowe and Andretti’s Salvador de Alba secured third and fourth. Hauger extended his points lead to 187, ahead of Hughes on 172 points and Rowe losing ground in third on 134 points.