Rich Homie Quan, a platinum-selling rapper from Atlanta, is dead ... TMZ Hip Hop has confirmed.

RHQ died Thursday in his Atlanta home ... according to his family and the local morgue.

Rich Home Quan's family tells TMZ Hip Hop ... they are shattered and heartbroken by his sudden death.

Born Dequantes Lamar in Atlanta, RHQ first burst onto the scene in 2013 with his instant classic hit, "Type of Way" ... and followed through with fan favorites in "Flex (Ooh, Ooh, Ooh) and "Ride Out."

Rich Homie Quan later joined Young Thug on the Cash Money Records project, "Rich Gang" ... and was he was a frequent collaborator with his hometown homies, 2 Chainz and Jacquees.

The last time we spoke to him, RHQ ripped the current state of hip hop for its murderous lyrics and cookie-cutter song formats.