Ranjeet Kumar, known online and on stage as Smart Ranjeet Kumar, is an Indian author and digital entrepreneur from Kerpa village in Rohtas district, Bihar, born 2 January 2003 into a farming family. He began his career as a stand-up comedian, later appeared in television shows and Hindi-language films, and has performed on The Kapil Sharma Show and Comedy Nights with Kapil.

He is known for digital branding work. He founded Media Source Hub, a digital media services platform based in Tilouthu, Rohtas, which offers Google Knowledge Panel and profile verification work. He also writes self-published books on personal branding and entr