Diet Mountain Dew is a no-calorie Mountain Dew that was first introduced in 1986.

[1] It was formerly known as "Sugar-Free Mountain Dew" until 1986, when it was given its current name.

In 2006 Diet Mountain Dew was reformulated with a new "Tuned Up Taste", using a blend of sucralose, aspartame, and acesulfame potassium as sweeteners.

The previous formulation was sweetened exclusively with aspartame.

[2] This soft drink–related article is a stub.