"Tell Me" is a song performed by South Korean girl group, Wonder Girls from their debut album, The Wonder Years (2007). It was released as the third and lead single on September 13, 2007 from the album. The song was written and produced by Park Jin-young and it samples Stacey Q's "Two of Hearts." "Tell Me (Rap version)", featuring Yubin's rap verse, was added as a B-side on their second maxi single, So Hot. Yubin is credited as the writer of the version. "Tell Me" was a strong hit from the group, topping various online and offline charts. It went to number one on various charts and received number one position on KBS's music chart show Music Bank, staying at that position for seven consecutive weeks and received a triple crown at SBS Inkigayo. The song is notable for its choreography, which was widely imitated and featured on various online video sites.

When producer Park Jin-young first introduced the song to the group, the Wonder Girls felt that the song was too different and would not be successful. However, once they were used to the song, they eventually believed it could be a strong single.

"Tell Me" is a fast-tempo song about a girl who has fallen in love who hopes that he likes her too which she asks him to tell her that he likes her too. The highlight of the song is an exclamation of surprise, "어머나!" (Eomeona!, similar in meaning to "Oh, my goodness!) during the chorus which member Sohee does her trademark “Omona” expression.

JYP Entertainment stated in June 2009 that "Tell Me" would be the second English single for the group, after "Nobody". On May 15, 2010, they released their second American single "2 Different Tears" (also known as 2DT), which includes "Tell Me" on the track list.

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