"If You Only Knew" is the fourth single by American rock band Shinedown from their 2008 album, The Sound of Madness. The music video premiered on October 6, 2009.

The song was written about Brent Smith's ex-girlfriend when she was pregnant with their child. Smith has described the song as "their first ballad".

The song was used in a promo for ABC's daytime drama One Life to Live.

"If You Only Knew" was certified gold by the RIAA for selling over 500,000 copies.

On the week ending November 14, 2009, "If You Only Knew" debuted on the Billboard Hot 100 at #92. Five weeks later, it peaked at #42. On the week ending February 6, 2010, it matched its peak. "If You Only Knew" peaked at #64 in Canadian Hot 100

This video takes place on the steel skeleton of a skyscraper in New York City that has yet to be finished being built. While the main focus of the video is upon the band playing there are also shots of couples standing around the rafters of said building.

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