"So Help Me Girl" is a song written by Howard Perdew and Andy Spooner, and recorded by American country singer Joe Diffie. It was released in January 1995 as the third single from his fourth studio album, Third Rock from the Sun (1994). The song reached number 2 on the Billboard Hot Country Singles & Tracks chart and number 84 on the Billboard Hot 100.

The music video was directed by Gerry Wenner and premiered in early 1995.

"So Help Me Girl" debuted at number 59 on the U.S. Billboard Hot Country Singles & Tracks for the week of February 4, 1995.

"So Help Me Girl" was covered by Gary Barlow and released as the third single from his debut solo album Open Road (1997) in Europe on July 11, 1997, and as the lead single from the album in the United States on September 30, 1997. The single was released in 65 countries around the world and topped the charts in 13 countries.

Following the success of the album in the United Kingdom, Barlow signed a record deal with Arista records for the album to be released in America. He reworked the album for the American market and subsequently released a remixed version of "So Help Me Girl" as the lead single there. Billboard gave the American version a positive review, saying that it did not stray from Barlow's work in the group Take That. He also praised Barlow's "boyish teen-idol charm" and "flexible tenor."

Two music videos were released for So Help Me Girl. The first video, accompanying the European release of the single, features Barlow taking a girl home after a night out, and waking up the next morning and realising that he has cheated on his girlfriend. He performs the majority of the song in the bedroom, before moving to a piano for the final scenes, which depict a fight between his girlfriend and the girl he took home. The second video, accompanying the American release of the single, begins with Barlow sitting alone on a bridge and throwing a rose into the water below, whilst a mysterious woman looks on. He then continues to perform the song whilst looking through the windows of a darkened house, where he spots a young girl. The video continues with Barlow walking through a lighted tunnel of moving cars, before returning to the house and performing the final line of the song to the girl personally.

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