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

What We Do in the Shadows is an American comedy horror mockumentary television series created by Jemaine Clement, first broadcast on FX on March 27, 2019. The series follows four vampire roommates on Staten Island and stars Kayvan Novak, Matt Berry, Natasia Demetriou, Harvey Guillén, Mark Proksch, and Kristen Schaal.