Teigan O’Shannassy (born 14 April 1999) is an Australian netball player in the Suncorp Super Netball league, playing for NSW Swifts.

O’Shannassy was elevated to the Giants senior team ahead of the 2019 season, after having been a training partner with the extended Giants squad the previous two years.^[3] The Giants elevated O’Shannassy into the line-up despite the fact she suffered a serious Achilles injury whilst representing the New South Wales Institute of Sport at the 2018 Netball New Zealand Super Club tournament.^[3] Prior to that setback she claimed a silver medal with the Canberra Giants in the Australian Netball League in 2018 and represented Australia at the World Youth Cup the previous year. In 2022, she informed the GIANTs that she would depart the club ahead of the following season, having signed a contract with Briony Akle’s side, the premiership winning NSW Swifts, playing in the team alongside Manly Warringah Sapphires teammate Kelly Singleton, who was elevated into the contracted 10 for the 2022 season following Sophie Garbin’s departure. Teigan O’Shannassy remains a member of the Manly Warringah Sapphires Opens side, who play in the NSW premier league.^[4][5]