The NASCAR K&N Pro Series West, formerly the Winston West Series and Camping World West Series, is a regional stock car racing division of NASCAR. The series was first formed in 1954 as a proving ground for drivers from the western United States who could not travel to race in the more traditional stock car racing regions like North Carolinaand the rest of the southern United States.

In 1954, the series was formed under the name Pacific Coast Late Model circuit, with nine races on the schedule. At first the series sanctioned races on dirt tracks and paved tracks, but as the series developed, more races were held on paved tracks, with the final race on a dirt track being held in 1979 until the series returned to dirt in 2018. In 1988, the series traveled out of the United States for the first time, sanctioning a race in Australia. Eight years later, the series once again traveled outside the United States to Japan. In 1999, the season finale was held at Twin Ring Motegi, making it the first NASCAR championship race held in a different country. Four years later, NASCAR consolidated the Busch North Series into the series.