Knock Knock is an American gift company and book publisher founded by Jen Bilik on January 1, 2002.

The company is based in Los Angeles, California.

[1] In January 2018, Knock Knock acquired Emily McDowell Studio (renamed Em & Friends) and Sisters of Los Angeles (renamed People, Places & Things).

The three individual companies are now under one umbrella: the newly formed Los Angeles based Who's There Group.

[2] In 2007, Knock Knock began publishing humorous nonfiction[3] including How to Traumatize Your Children: 7 Proven Methods to Help You Screw Up Your Kids Deliberately and with Skill.