"Dey Know" (sometimes called "They Know") is a song by American hip hop recording artist Shawty Lo, released on December 4, 2007, as his commercial debut single.

The song also serves as the lead single from Shawty Lo's debut solo album, Units in the City.

The remix features guest verses from Shawty Lo's fellow Southern hip hop artists, Ludacris, Young Jeezy, Plies and Lil Wayne.

There is also an "NY Remix" featuring New York hip hop artists Maino, Lil' Kim and Busta Rhymes.

Several rappers have also recorded unofficial remixes as well as freestyles, including Yo Gotti, Rick Ross, Young Jeezy, Paul Wall, Papoose, Bun B, Kardinal Offishall, Rock City, Re-Up Gang, Crooked I, Casely, Driver and Prefuse 73, among others.