"Who's That Girl?" is a 1983 song recorded by the British pop duo Eurythmics. It was written by bandmembers Annie Lennox and David A. Stewart and produced by Stewart. "Who's That Girl?" was the first single released in the UK from Eurythmics' third album Touch.

The song features Lennox in the role of a suspicious woman demanding to know with whom her lover has been seen associating. The song became Eurythmics' third Top 10 single in the UK singles chart, peaking at number three. In the United States, "Who's That Girl?" was released as the second single from the album, following the Top 10 hit "Here Comes the Rain Again". It climbed to number twenty-one on the Billboard Hot 100.

The music video became a heavily played clip on MTV and further showcased Lennox's gender-bending image. In it, she appears as a nightclub singer performing the song (complete with 1960s-era blonde flip wig) and also as a male member of the audience akin to Elvis Presley (as seen on the cover of the single). At the end of the video, the female Lennox is shown kissing the male Lennox.

Stewart appears in the video, escorted by a variety of different women played by a variety of guest stars including Cheryl Baker and Jay Aston of Bucks Fizz, Kiki Dee, Hazel O'Connor, Kate Garner of Haysi Fantayzee and all four members of Bananarama (including Stewart's future wife, Siobhan Fahey and future group member Jacquie O'Sullivan who would replace Fahey in Bananarama in 1988). The gender-bending pop star Marilyn also makes an appearance in the video as another of Stewart's escorts. Despite the small role, Marilyn's appearance proved a high-profile move which helped lead to his own music career later the same year.

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