Sebastine Ikahihifo (born 27 January 1991) is a New Zealand professional rugby league footballer who plays as a prop and loose forward, most recently for the Huddersfield Giants in the Super League.

He previously played for the New Zealand Warriors in the NRL.

Ikahihifo was born in Auckland, New Zealand, and is of Tongan descent.

He played his junior rugby league for the Mangere East Hawks.^{[citation needed]}

He signed for the New Zealand Warriors in 2010 and played 36 games in the Toyota Cup, being part of the 2010 and 2011 grand final victories. In 2012, Ikahihifo played for the Auckland Vulcans in the NSW Cup.

In round 21 of the 2012 NRL season, Ikahihifo made his first grade début for the New Zealand Warriors against the Manly-Warringah Sea Eagles playing off the interchange bench in the Warriors' 24–22 loss at NIB Stadium in Perth. Ikahihifo played in 4 matches for the Warriors in the 2012 NRL season.

Ikahihifo finished the 2013 NRL season with him playing in 8 matches for the Warriors.

In February 2014, Ikahihifo was selected in the Warriors' inaugural 2014 Auckland Nines squad. In June 2014, Ikahihifo had his contract extended to the end of the 2015 season. Ikahihifo finished off the Warriors' 2014 NRL season with him playing in 18 matches.