The 2025 Iowa Corn 350 was a NASCAR Cup Series race held on August 3, 2025, at Iowa Speedway in Newton, Iowa. Contested over 350 laps on the 0.875-mile (1.408 km) D-shaped oval, it was the 23rd race of the 2025 NASCAR Cup Series season.

William Byron won the race. Chase Briscoe finished 2nd, and Brad Keselowski finished 3rd. Ryan Blaney and Ryan Preece rounded out the top five, and Bubba Wallace, Alex Bowman, Carson Hocevar, Joey Logano, and Austin Dillon rounded out the top ten.

Iowa Speedway is a 7/8-mile (1.4 km) paved oval motor racing track in Newton, Iowa, United States, approximately 30 miles (48 km) east of Des Moines. The track was designed with influence from Rusty Wallace and patterned after Richmond Raceway, a short track where Wallace was very successful. It has over 25,000 permanent seats as well as a unique multi-tiered Recreational Vehicle viewing area along the backstretch. The track hosts the NTT IndyCar Series and NASCAR events.

After the 2020 race was canceled due to the pandemic, the race was removed from the 2021 schedule. In 2024, it was announced that the Xfinity Series would return to Iowa with a Cup Series race.

Christopher Bell was the fastest in the practice session with a time of 23.511 seconds and a speed of 133.979 mph (215.618 km/h).

Chase Briscoe scored the pole for the race with a time 23.004 of and a speed of 136.933 mph (220.372 km/h).

Stage One Laps: 70

Stage Two Laps: 140