Jack Anstey (born 1997) is an Australian Professional Track and Field athlete. He holds the Australian and Oceanian Records in the indoor 1000m.[1] He holds the second fastest indoor Mile by an Australian at 3:51.51. Before turning professional, he graduated from Illinois State University in 2021 where he was a NCAA Division 1 First Team All-American. Anstey now trains in Flagstaff, AZ where he is sponsored by Under Armour. He has represented Australia at the 2022 World Indoor Championships and the 2023 World Road Running Championships.