Judith Hoag is an American actress, best known for playing April O’Neil in Teenage Mutant Ninja Turtles (1990) and Gwen Cromwell Piper in the Disney Channel television film series Halloweentown, from 1998 to 2006.

Hoag is also known for her recurring roles as Cindy Dutton Price in the HBO drama series Big Love (2006–2011), Tandy Hampton in the ABC musical drama series Nashville (2012–2018), and Stephanie Quinn in the Syfy fantasy drama series The Magicians (2016–2020).