Sebastián Eduardo Crismanich (born 30 October 1986 in Corrientes) is an Argentine taekwondo athlete. He won the gold medal in the men's 80 kg division at the 2012 Summer Olympics.
Sebastián is the first individual athlete to win a gold medal for Argentina since the 1948 Games, when Delfo Cabrera won the marathon, and the first to win a taekwondo medal for Argentina.
In his quest for the gold medal, Crismanich beat New Zealander Vaughn Scott 9-5, and then Afghan Nesar Ahmad Bahawi 9-1 in the quarterfinals.
After a fierce battle in the semifinals, Crismanich defeated Armenian Arman Yeremyan 2-1 and proceeded to the Olympic final.
In a narrow victory against Spaniard Nicolas Garcia Hemme, Crismanich was only able to take the advantage needed to win in the final round, seconds from the end.
He was the flag bearer for his country at the closing ceremony of the 2012 Summer Olympic Games held in London, England.
Sebastián Crismanich was born in Corrientes, Corrientes Province, into a Croatian immigrant family (Croatian: Krizmanić). His brother, Mauro, is also a well-known taekwondo practitioner who won the bronze medal in men's flyweight (under 58 kg) at the 2009 World Taekwondo Championships in Copenhagen.