Aaron Deer (born November 1, 1980) is a songwriter and multi-instrumentalist originally from Indianapolis, Indiana, now residing in Oakland, California.
He is best known for his work in the Bloomington music scene in the early 2000s, playing with bands such as The Impossible Shapes, John Wilkes Booze, and The Horns of Happiness.
In the winter of 2009, Deer relocated to California and continues work with The Horns of Happiness, Royal Geography Society, Farmer Dave Scher and Wee Giant, among others, while co-running the Magnetic South cassette label.