Tanith Belbin (born July 11, 1984 in Kingston, Ontario) is a Canadian-American figure skater. She holds dual-citizenship.

Her partner in ice dance figure skating competitions is Benjamin Agosto. Though they earned silver medals for the United States at the 2005 World Figure Skating Championships, the pair feared they could not compete at the 2006 Winter Olympics as Belbin was not yet an American citizen.

However, by a special act of Congress on December 28, 2005, which President George W. Bush signed on December 31, 2005, Belbin became a naturalized citizen, effectively making her able to compete for the United States at the 2006 Winter Olympics. In January 2006, the pair won their third consecutive national title and qualified for the Olympics.

At the Turin Olympics, they won silver in ice dancing, the highest Olympic result of any American pair in the discipline, and the first American ice dancers to win an Olympic medal in 30 years.

Competitive highlights:
(all with Agosto)

2000:
U.S. Championships (Junior) - 1st
World Junior Championships - 3rd
2001

U.S. Championships - 2nd
World Junior Championships - 2nd
World Championships - 17th
Goodwill Games - 5th

2002:
U.S. Championships - 2nd
Four Continents Championships - 2nd
World Junior Championships - 1st
World Championships - 13th

2003:
U.S. Championships - 2nd
Four Continents Championships - 2nd
World Championships - 7th
Grand Prix Final - 3rd

2004:
U.S. Championships - 1st
Four Continents Championships - 1st
World Championships - 5th
Grand Prix Final - 2nd

2005:
U.S. Championships - 1st
Four Continents Championships - 1st
World Championships - 2nd

2006:
U.S. Championships - 1st
Four Continents Championships - 1st
XX Olympics - 2nd
Compulsory Dance - 6th
Original Dance - 2nd
Free Dance - 4th
World Championships - 3rd