Lochie O'Brien (born 18 September 1999) is a professional Australian rules footballer playing for the Carlton Football Club in the Australian Football League (AFL). He was drafted by Carlton with their second selection and tenth overall in the 2017 national draft. He made his debut in the eighty-six point loss to North Melbourne at Blundstone Arena in round four of the 2018 season. Lochie was given a contract extension keeping him at the club until 2021.