"Gee" is a song recorded by South Korean girl group Girls' Generation. The original Korean version was released as a single from their extended play of the same name on January 5, 2009. Written by Ahn Myung-won and Kim Young-deuk, "Gee" is primarily a bubblegum pop and electropop song with elements of hip hop and techno that lyrically talks about the girls' affections when they are in love. The single was a success in the group's native country, claiming the top spot on Music Bank for a record-breaking nine consecutive weeks and on Inkigayo for three weeks. It was the best-selling single of 2009 in South Korea.

A Japanese version was written by Kanata Nakamura and was later released as the group's second single in Japan in October 2010 in conjunction with their foray into the Japanese music scene. The single peaked at number two on the Oricon Singles Chart and number one on the RIAJ Digital Track Chart, and received certifications from the Recording Industry Association of Japan on four bases–physical single (gold), digital download (platinum), chaku-uta (double platinum), and full-length chaku-uta (million). "Gee" has been widely recognized as a K-pop standard and considered as the leader in modern Korean bubblegum pop trends.

"Gee" is a fast-tempo song about a girl who has fallen in love for the first time. The title is supposed to be an exclamation of surprise, an expression similar to “Oh my gosh”, or more similarly, "!" in English. The song "Dancing Queen", from their later released 2013 album I Got a Boy, was scrapped due to copyright issues and "Gee" was chosen instead. Girls' Generation had their first promotional activity for the song on the MBC's music show Music Core on January 10. "Gee" eventually became a hit, achieving nine consecutive top one on the KBS's Music Bank, and eight consecutive wins on the Mnet 's chart, setting a record at the time. It was named as the "Song of the decade" by South Korea's online music website, MelOn, and chosen to be the most popular song of 2009 on Music Bank. The song has also won several major awards such as "Digital Daesang" and "Digital Bonsang" at the 2009 Golden Disk Awards, "Daesang" and "Digital Music" awards at the 19th Seoul Music Awards, and "Song of the Year" at the 7th Korean Music Awards.

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