"Let Me Know" is a song by Irish singer Róisín Murphy from her second studio album, Overpowered (2007). The song was written and produced by Murphy and Andy Cato. It was released on 8 October 2007 as the album's second single. "Let Me Know" reached number 28 on the UK Singles Chart, becoming Murphy's highest-peaking solo single to date.

The art director of the single was British graphic designer Scott King and the photographer was Jonathan de Villiers. Murphy is depicted wearing a design by English fashion designer Gareth Pugh on the cover.

"Let Me Know" received positive reviews from music critics. While reviewing Overpowered, Mark Edwards of The Sunday Times commented that the song's hook is "strong enough to compensate for the album's duller moments." Nick Levine of Digital Spy gave the song four out of five stars, stating that it "melds propulsive synths, a nineties house piano riff and Murphy's crystalline vocals to create a groove that's harder to resist that a night of passion with Brad or Angelina (or both of them—whatever floats your boat, eh?)." Gemma Hampson wrote for musicOMH that it "retains a bit of that Moloko odd-ness that set the band aside from all the other disco, funk, dance groups around at the same time. Murphy's soft and feminine voice sits well above the '80s bouncy bass and funky electro percussion. It's got a good, retro beat, ruined slightly by the dated fake piano heard all too much in dance in the past 25 years."

Credits adapted from the liner notes of the CD single.

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