The 2017 NASCAR Xfinity Series was the 36th season of the NASCAR Xfinity Series, the second-tier professional stock car racing series sanctioned by NASCAR in the United States. The season began with the PowerShares QQQ 300 at Daytona International Speedway and ended with the Ford EcoBoost 300 at Homestead-Miami Speedway. Daniel Suárez was the defending drivers' champion while Toyota was the defending manufacturer's champion, although Suárez couldn't defend his title due to him racing in the Monster Energy NASCAR Cup Series.

Stock car racing events in the NASCAR Xfinity Series has been held at the Homestead–Miami Speedway since the track's inauguration in 1995. For much of its history, it was the final race of the second-tier series' season. The event is currently named Contender Boats 300 for sponsorship reasons; with exception of one-off emergency races in 2020 and a one-off change in 2021, the race has been held as a 300-mile race.