Kat Falls is an American novelist specializing in science-fiction. She is known for her middle-grade science fiction novels, including Dark Life and its sequel Rip Tide, as well as Inhuman and its sequel Undaunted.

Kat Falls was born in Silver Spring, Maryland and currently resides in Evanston, Illinois with her husband, theater director Robert Falls, their three children, and a whole slew of pets. She grew up in Silver Spring and attended Rensselaer Polytechnic Institute as an undergraduate. She went on to receive an MFA from Northwestern University, where she now teaches.

She describes her novels, Dark Life and Rip Tide, as "underwater westerns." The idea for Dark Life came to her during a writing exercise, when she combined her son's interests in the ocean, Wild West pioneers, and the X-Men to create a story premise that kept her up nights plotting and world-building.