"Mad Hatter" is a song by Melanie Martinez featured as the thirteenth track on her debut album, Cry Baby. At the end of July 2015, Melanie's father, Jose Martinez, posted a 13-second snippet of the song. On August 11th, 2015, Melanie posted another snippet of the song on her Instagram. The music video was released on September 23rd, 2017, completing the visuals for the album.