Justin Long (b. 1978) is an actor and comedian known for his recurring role on the NBC sitcom Ed, and has had parts in films such as Galaxy Quest and Dodgeball. Long also voiced Alvin in the Alvin and the Chipmunks films.
In the 2000s, Long appeared in Apple's "Get a Mac" ad campaign, playing the human personification of a Mac. This was referenced in Sesame Street Episode 4224 with Mack, an iPogo spokesman caricatured after Long.