Harry Collett (born January 17, 2004) is a British actor best known for his roles as Jacaerys Velaryon in "House of the Dragon" (2022), the adventure film "Dolittle" (2020), where he played Tommy Stubbins, and as Jip in the epic fantasy "The Voyage of Doctor Dolittle" (2020). He has also portrayed the young version of the main character in the World War II drama "Dunkirk" (2017).