Crazy Ex-Girlfriend is an American romantic musical comedy-drama television series that premiered on October 12, 2015, on The CW and ran for four seasons, ending on April 5, 2019. The series was created, written, and directed by Rachel Bloom and Aline Brosh McKenna and stars Bloom in the lead role as Rebecca Bunch, a lawyer who moves from New York City to West Covina, California, to pursue her ex-boyfriend from high-school summer camp. Many of the musical numbers take place in Rebecca's imagination. While these numbers often represent Rebecca's real interactions and encounters, the music is entirely imagined.

The show received widespread critical acclaim and developed a cult following, despite drawing consistently low ratings throughout its four-season run. It won several awards including multiple Primetime Emmy Awards, a Golden Globe Award, and a Critics Choice Award. It is one of the lowest-rated shows in television history to be renewed through four seasons by its parent network.