"D.D.D." (stylized as D.D.D. feat. SOULHEAD) is a song recorded by Japanese recording artist Kumi Koda, taken from her second greatest hits album, Best ~second session~ (2005). It contains guest vocals from Japanese music duo Soulhead. It was written by Soulhead members and sisters Yoshika and Tsugumi, with production being done by Octopussy. The song is Kumi's first collaborative effort since her single "Hot Stuff" with Japanese rapper KM-MARKIT, which was released a month prior. As part of Kumi's 12 Singles Collection releases, "D.D.D." premiered on December 21, 2005 as the third single from the album. The CD cover sleeve has Kumi wearing a black mini-dress and headdress. The cover sleeve is to represent the country United Kingdom, and its symbolism of Britannia.

Musically, "D.D.D." is a dance song that borrows numerous musical elements such as R&B. The song borrows a 4-bar melody from the Missy Elliott and Rockwilder's remake of "Lady Marmalade." The song is sung in half Japanese and half English. The song received favorable reviews from music critics, who commended the song's production and song writing. The composition and Soulhead's collaboration was also complimented.

Restricted to 50,000 units, "D.D.D." reached #5 on the Japanese Oricon Singles Chart, and sold over 48,000 units in that region. The song also reached number five on the Japanese Count Down TV Singles Chart. The accompanying music video for "D.D.D." was shot in Japan: it features Kumi and Soulhead dancing in a cave, with individual scenes of them with men in a jail cell. To promote the single, it was featured in several concert tours conducted by Kumi, including her tour for Best ~second session~ and her 2013 Japonesque tour. A variation of the single, entitled "XXX," was released by SOULHEAD on their single Pray/XXX in 2006.

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