Lost Mountain is an unincorporated community in Cobb County, in the U.S. state of Georgia.

"[1] A post office called Lost Mountain was established in 1848, and remained in operation until 1902.

[4] The Lost Mountain store is a major landmark for the area, It has gone from the only store to a relic from another time stuck in the middle of the present day shopping centers of suburban Atlanta and yet it stands as it has since 1881.

[5] Mars Hill Community Church is located across the street from The Lost Mountain Store.

On May 22, 2022, a ballot measure failed that would have led to the incorporation of the City of Lost Mountain.