"I'm in Love with a Monster" is a song recorded by American girl group Fifth Harmony for the 2015 animated film, Hotel Transylvania 2. It was released to digital retailers on August 14, 2015 through Epic Records and Syco Music. It was sent to US contemporary hit radio on August 18, 2015. The music video premiered at the Sony billboard in Times Square on August 27, 2015. The song won the award for Choice Song from a Movie or TV Show at the 2016 Teen Choice Awards.

The announcement that Fifth Harmony would be releasing a promotional single for Sony Pictures Animation's Hotel Transylvania 2 was made by Lia Vollack, president of Worldwide Music for Sony Pictures, on June 16, 2015. When making the announcement at the press release, Vollack commented, "There are few groups out there that can match the incredibly fun feel and animated vision that Genndy Tartakovsky is bringing to Hotel Transylvania 2, and Fifth Harmony knocked it out of the park. The song is exactly what we were hoping for."

A preview of "I'm in Love with a Monster" was featured in a trailer for the movie and this was released on June 17, 2015. The song was released for digital download on August 14.

Christina Garibaldi of MTV News complimented the production and "its deep, heavy beats, trombones and drums over an almost creepy base." Robbie Daw, from Idolator, pointed out the resemblance to 1960s girl groups, such as the Supremes and Martha Reeves and the Vandellas, and said, "Fifth Harmony's vocal ability shine brightly." Writing for Fuse, Jeff Benjamin compared the "booming tuba" to the 1960s track, "Big Spender." From PopCrush, Samantha Vicenty noted the difference of sound compared to the group's album, Reflection, and stated, "tone-wise, the lighthearted track does seem a perfect fit for the movie." Phillip Picardi of Teen Vogue wrote that the song is "catchy and upbeat, with a nod to the '60s — a cross between early Pussycat Dolls and The Supremes".

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