Fakahau Valu (born July 1, 1950) is a former Tongan rugby union player. He played as a flanker. He made his debut against the Māori All Blacks in 1973. Valu captained Tonga at the 1987 Rugby World Cup, he played his last game against Ireland. He was a member of the Tongan squad that handed Australia a shocking 16-11 defeat on June 30, 1973 at Ballymore Stadium. Valu was inducted into IRB's Pathway of Fame. In 2008, Valu was awarded with the Order of Queen Sālote Tupou III and a year later, he was inducted to the Tongan National Sports Hall of Fame along with Kitione Lave, Paea Wolfgram, Taufa'ahau Tupou IV, Tali Kavapalu and Motuliki Kailahi. Valu is also a member of the organising committee for the 2019 Pacific Games.
He coached Tonga at the 1995 Rugby World Cup.