"That's Why (I Love You So)" is a song written by Berry Gordy Jr. and Tyran Carlo and performed by Jackie Wilson. It reached #2 on the U.S. R&B chart and #13 on the U.S. pop chart in 1959. It was featured on his 1959 album Lonely Teardrops. The song was arranged by Dick Jacobs. The song ranked #90 on Billboard's Year-End Hot 100 singles of 1959.