"It Ain't Nothin'" is a song written by Tony Haselden, and recorded by American country music artist Keith Whitley. It was posthumously released in October 1989 as the second single from the album I Wonder Do You Think of Me. His fifth and last No. 1 on the Billboard Hot Country Singles chart, the song was his second posthumous chart-topper, reaching the top of the chart seven months after his death. The song spent one week at No. 1 and 17 weeks in the Hot Country Singles chart's top 40.