Alan Decker was an American re-recording mixer.

He is perhaps best known for his work on the television series Homeland and Outlander, and for the National Geographic special Avalanche: The White Death.

Decker began his career in production sound and studio engineering, working as a sound mixer, dialogue editor, sound designer, supervising sound editor, and a re-recording mixer. He held positions at 3rd Street Sound, National Geographic, Stage 2 Audio, Sony Pictures, Universal, and Technicolor.

For over three decades, Decker contributed to a number of the television series including The Tick, Carnivàle, Strong Medicine, Lincoln Heights, Justified, The Simpsons, Franklin & Bash, Suits, Psych, Chicago P.D., Ray Donovan, Covert Affairs, Grimm, Bates Motel, Good Girls, and For All Mankind.

In 1999, he shared a Primetime Emmy win for Outstanding Achievement in Nonfiction Programming – Sound Mixing for his contribution to Avalanche: The White Death. He was nominated six more times for Outstanding Sound Mixing.

Decker died December 23, 2020, in Los Angeles, California.