The 2021 NASCAR Xfinity Series Championship Race was a NASCAR Xfinity Series race held on November 6, 2021. It was contested over 200 laps on the 1.00-mile (1.61 km) oval. It was the thirty-third and final race of the 2021 NASCAR Xfinity Series season, as well as the championship race.

The race was Michael Annett's last before his retirement.

Phoenix Raceway – also known as PIR – is a one-mile, low-banked tri-oval race track located in Avondale, Arizona. It is named after the nearby metropolitan area of Phoenix. The motorsport track opened in 1964 and currently hosts two NASCAR race weekends annually. PIR has also hosted the IndyCar Series, CART, USAC and the Rolex Sports Car Series. The raceway is currently owned and operated by International Speedway Corporation.

The raceway was originally constructed with a 2.5 mi (4.0 km) road course that ran both inside and outside of the main tri-oval. In 1991 the track was reconfigured with the current 1.51 mi (2.43 km) interior layout. PIR has an estimated grandstand seating capacity of around 67,000. Lights were installed around the track in 2004 following the addition of a second annual NASCAR race weekend.

John Hunter Nemechek was the fastest in the first practice session with a time of 27.610 seconds and a speed of 130.388 mph (209.839 km/h).

Austin Cindric scored the pole position after a time of 27.293 seconds and a speed of 131.902 mph (212.276 km/h). Landon Cassill, Stephen Leicht, Spencer Boyd, Ryan Ellis, Timmy Hill, and Joey Gase failed to qualify.

Stage One Laps: 45

Stage Two Laps: 45