"Do You Know? (The Ping Pong Song)" is a song by Spanish singer Enrique Iglesias. It was released on 15 May 2007 as the first single from his eighth studio album, Insomniac and takes the latter part of its English name from the sample of a ping pong ball bouncing that is employed as a percussion track throughout the song. The song's Spanish version is entitled "Dímelo" and was released to Latin radio, becoming Iglesias' 17th number one song on the US Billboard Hot Latin Songs. In 2007 the song sold 3.1 million copies worldwide.

Iglesias generally refers to the song as simply "Do You Know?", as it was his record label's insistence to add on "The Ping Pong Song" in parentheses to make it more distinctive and marketable.

The instrumental backing tracks are based on sampled loops from the well-known production company Bunker 8 Digital Labs. These samples include all of the original tracks in "Otiga Verde" from the sample library. The opening piano, guitar chord riffs, and lead sound synthesizer which is heard throughout the song are directly lifted from the individual sample loops.

Iglesias premiered the song on Ryan Seacrest's radio show on KIIS-FM on Tuesday, 10 April 2007. The song was officially shipped to radio stations and, a week later, reached number 102 on the Billboard Bubbling Under Hot 100 Singles chart.

Iglesias performed the song on Dancing with the Stars on 15 May 2007, on the day that the song was made available in the U.S. iTunes Store as a digital single, where it eventually reached number 13.

The song soon made its debut on the Billboard Hot 100 at number 33. It reached the top ten on the Billboard Hot Dance Club Play, peaking at number 3.

The song reached number three on the UK iTunes Store, making its debut on the UK Singles Chart at number 28 and climbing to number nine in its second week, and was released as a physical CD single format on Monday, 11 June. The song has reached number three on the UK Singles Chart.

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