The 2005 NASCAR Whelen Modified Tour was the 21st season of the Whelen Modified Tour (WMT), and the first with Whelen Engineering as the title sponsor. It began with the Icebreaker 150 at Thompson Speedway Motorsports Park on April 10. It ended with the World Series of Auto Racing Pres. by Whelen at Thompson again on October 30. Tony Hirschman Jr., who entered the season as the defending Drivers' Champion, won his fifth and final championship after 18 races, seventeen points ahead of Ted Christopher.