"Oh" is a song recorded by American recording artist, Ciara who wrote the song with Ludacris (who features on the song), Andre Harris, and Vidal Davis. "Oh" was produced by Harris and Davis, who work as Dre & Vidal. The song was released worldwide on March 2, 2005 as the third single from her debut album, Goodies. The downtempo Crunk&B song features hip-hop elements and a heavy baseline, and can be seen as an anthem to her hometown, Atlanta, Georgia. Ciara sings about the many things the city has to offer, while Ludacris raps the third verse.

The song was well received by music critics, who praised the song's beat, specifically noting its radio-friendliness. It won an award at the 2006 ASCAP award shows for "Most Performed Songs" with the two previous singles from Goodies, "Goodies" and "1, 2 Step." The song also took home the award for "Choice Music Make-Out Song" at the 2005 Teen Choice Awards and for "Coolest Collabo" at the 2006 Vibe Awards. The song was listed at number 127 on Pitchfork Media's top 500 songs of the 2000s. The song was placed at number 72 on Slant's The 100 Best Singles of the Aughts. It, along with other songs on Goodies, helped earn Ciara the nomination for Best New Artist at the 48th Grammy Awards.

The single was a commercial success, peaking at number two in the United States, becoming her third consecutive top three hit. It also peaked within the top ten of charts in many international markets, including Germany, New Zealand and the United Kingdom, and was certified platinum in the US and gold in Australia. The song was accompanied by a music video, which showed the singer dancing with friends in the streets of Atlanta, as well as in an arena and a parking garage.

In 2004, Ciara was in the recording studio with Dre & Vidal. She decided to take the beat back to Atlanta, Georgia. It took Ciara one week to complete the lyrics for the love song to Atlanta. She quoted, "I didn't waste time and just write to any beat. If I don't like a beat, I won't work with it." Also she recalled, "I wanted to make sure that we were actually talking about Atlanta".

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