"So Small" is a song composed by singer Carrie Underwood, Hillary Lindsey, and Luke Laird. It is the first single from Underwood's second studio album, Carnival Ride, released in Canada on August 14, 2007, and in the United States on August 28, 2007. (See 2007 in music).

"So Small" is the first single for which Underwood shares a writing credit. Underwood co-wrote the song "I Ain't In Checotah Anymore" but it was not released as a single from her debut album, Some Hearts.

Underwood's quote on So Small:

"So Small" was officially released to country radio stations on July 31, 2007.

The single was digitally released on Napster on August 14, 2007, the same day it was made available for sale on the Canadian iTunes Store, but was removed after several days. The song was permanently available for download on Napster and released on the U.S. iTunes Store on August 28, 2007.

She debuted this song at the 2007 Country Music Association Awards.

Underwood's video for "So Small" was directed by Roman White. The video was originally planned to be premiering on September 13 on CMT, but instead premiered on September 20, 2007 on CMT, where the channel became "Carrie Music Television" and aired the video continuously from 6:00am–12:00pm straight, playing it an estimated 66 times. The video was also made available to purchase exclusively on the iTunes music store on September 20.

The video begins with a teenager girl walking down a country road alone at dusk, carrying only a backpack. A flashback is shown of her arguing with her mother before she walks out of her house. Two cars are then shown approaching her from opposite ends, driven by a man (played by Christian Kane) and a crying woman. As the woman's car nears the teenager, she steps in front of it in an attempt to commit suicide. The woman swerves to the left side of the road to avoid hitting her, colliding instead with the man's car. Both vehicles freeze in mid-collision with their occupants unharmed and unaffected by the collision, while the front of the vehicles crumple from the impact and the windshields shatter, sending glass flying everywhere. Both the man and the woman have flashbacks of themselves leaving home after having a fight with their respective families and leaving them. As the night fades with a sunrise, the collision is reversed, and the teenager steps back from the road instead of onto it. Seeing this, both the man and the woman stop their cars and step out. The video ends with the three of them returning to their homes and reconciling with their families.

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