Tanith Jessica Louise Belbin (born July 11, 1984 in Kingston, Ontario) is a Canadian-American ice dancer. Though she holds dual citizenship, she competes for the United States and has competed for the U.S. since she began skating with Benjamin Agosto in 1998. With Agosto, Belbin is the 2006 Olympic silver medalist, three time Four Continents Champion (2004–2006), and five-time US National Champion (2004–2008).

Tanith Belbin was born in Kingston, Ontario and raised in Kirkland, Quebec (near Montreal). She lived and trained in Canton, Michigan for many years, but is currently training at the Ice Works Skating Complex in Aston, Pennsylvania in Delaware County. Aston is located about 10 minutes south of Philadelphia.

Belbin's mother is a costume designer and she makes some of Belbin's costumes.