Ilivasi Sevia Tabua Tamanivalu (born 30 September 1964 in Naivicula) is a former fijianrugby union footballer who played at international level for both Fiji and Australia as flanker. He was nicknamed The Human Skewer.
He was raised in a family of seven siblings five boys and two girls. He spent the first 12 years of his childhood in the Lau group as his father's was a teacher at one of the schools on the chiefly island. Ilivasi started school at Mabula, Cicia in Lau before his family moved to the mainland in the 1970s. His family settled at Naivicula, Tailevu where his father comes from. He attended Marist Brothers High School. In 1980, Ilivasi left to further his studies in Australia.
After retiring from international rugby, he came back to Fiji to help the Fiji team to prepare for the 2007 Rugby World Cup. He was recently appointed as the head coach of Fiji's HPU and helped the former Fiji coach Wayne Pivac with the Fiji team, but when Pivac resigned from Fiji rugby, Tabua was picked as the man to replace him and he was chosen as the new coach. He was also the first Fijian to be appointed the national coach to the Rugby World Cup. He comes at the tail end of a succession of expatriates including George Simpkin, Brad Johnstone, Greg Smith, Mac McCallion and Pivac who left in 2006. On 19 August 2009 Tabua was sacked by the Fiji Rugby Union citing off-field incidents during Fiji's 2009 IRB Pacific Nations Cup campaign.