Ratu Aca Ronald Gavidi Ratuva (born 30 December 1978) is a Fijian former professional rugby union player.
Ratuva gained his first cap for Fiji on 3 June 2005, in the 29–27 loss to New Zealand Māori.
He was a member of the Fijian squad at the 2007 Rugby World Cup.
He played in four matches of the successful campaign of his country, that reached for the second time ever the quarter-finals, including the 37–20 loss to South Africa.
He currently holds 17 caps for his country, with a try scored, 5 points in total.