Javier "Harvey" Guillén is a Mexican-American actor best known for his role as Guillermo de la Cruz, a human familiar, in the 2019 television series "What We Do in the Shadows."

Guillén has appeared as Alistair Delgado in "Huge" (2010), Cousin Blobbin in "The Thundermans" (2013-2018), George Reyes in "Eye Candy" (2015), and Benedict Pickwick in "The Magicians" (2017-2018).

He also appeared in "The Internship," a 2013 film.