John William Peers is an Australian professional tennis player who specializes in doubles.
He reached a career-high ATP doubles ranking of world No. 2 on 3 April 2017, and a singles ranking of No. 456 in June 2012.
He has won three Grand Slams, in doubles at the 2017 Australian Open with Henri Kontinen, and in mixed doubles at the 2022 US Open with fellow Australian Storm Sanders and the 2025 Australian Open with another compatriot Olivia Gadecki.
He has competed three times at the Olympic Games, winning the mixed doubles bronze medal in 2021 with Ashleigh Barty, and the doubles gold medal in 2024 with Matthew Ebden.