"Why Didn't I Think of That" is a song written by Bob McDill and Paul Harrison, and recorded by American country music singer Doug Stone.

The song reached the top of the Billboard Hot Country Singles & Tracks chart.

It was released in June 1993 as the fourth and final single from his CD From the Heart.

This song was originally recorded by the Marshall Tucker Band in 1988 on their "Still Holdin' On" album.

[2] The song's narrator is a man who did not treat his lady right, so he watches another man treat his lady right.