Wyatt Jess Oleff (born July 13, 2003) is an American actor, known for playing Stanley Uris in the 2017 supernatural horror film It as well as its 2019 sequel, It - Chapter 2. Both are directed by Andy Muschietti and based on the 1986 horror novel of the same name by Stephen King. Oleff also had a minor role in the Marvel Studios films Guardians of the Galaxy and Guardians of the Galaxy Volume 2, as the young Peter Quill; both films were directed by James Gunn.
Oleff was born in Chicago, Illinois, to Doug and Jennifer Oleff, living there for the first seven years of his life. He also has an older brother, Eli. Oleff then moved to Los Angeles with his parents, and began acting. One of his earliest acting roles was in a commercial for Coldwell Banker.
Oleff practices the Reform Jewish religion, similar to his character Stanley in It. He is also of the Ashkenazi Jewish ethnicity, with ancestors having immigrated from Russia.