Ruan Sims OAM (born 4 February 1982) is an Australian former rugby league and rugby union footballer.

She played rugby union for Australia. She was a member of the Wallaroos squad at the 2006, and 2010 Rugby World Cup where they finished in third place. She played rugby league for Australia at the 2013 & 2017 Women's Rugby League World Cup and was part of the squad that won the tournament.

She is the older sister of Fijian rugby league internationals Ashton, Tariq and Korbin.^[1] She was brought up in a sporting household in Gerringong where Ruan held the gumboot throwing record in 2013.^[1] Sims inherits her interest in Rugby from her mother, Jackie Sims. She works for Fire and Rescue NSW.^[2]

She was part of the Australian Jillaroos squad at the 2015 NRL Auckland Nines.^[3][4][5]

Sims was the first woman to receive a player contract in the NRL, signed with the Cronulla-Sutherland Sharks.^[6]

Since March 2017, Sims works with the ABC Radio Grandstand NRL commentary team, providing commentary both in-box and on the sideline.^[7] She is also a regular panellist on Nine Network's 100% Footy.^[8]

In April 2018, Sims stepped down as a Dally M Awards judge after casting votes for the Round 7 NRL game between Parrammatta and Manly at ANZ Stadium where she was not in attendance due to other commitments. Judges are required to attend their assigned games.^[9]

In June 2018, Sims was announced as one of fifteen marquee signings by the Sydney Roosters women's team which participated in the inaugural NRL Women's Premiership in September 2018.^[10]

Sims was awarded the Medal of the Order of Australia in the 2021 Queen's Birthday Honours list.^[11]