Tanith Jessica Louise Belbin (born July 11, 1984) is a Canadian-American ice dancer. Though born in Canada, she holds dual citizenship and has competed for the United States since she began skating with Benjamin Agosto in 1998. With Agosto, Belbin is the 2006 Olympic silver medalist, four-time World medalist, three-time Four Continents champion (2004–2006), and five-time U.S. champion (2004–2008).
Tanith Belbin began skating when she was almost three and started ice dancing at about eight or nine. She competed both as a pair skater and ice dancer in Canada before deciding to concentrate completely on ice dancing. She was introduced to ice dancing by Paul Wirtz and competed with partner Liam Dougherty. Her pairs partner was Ben Barruco, with whom she placed 2nd at the novice level at the 1997 Canadian Championships. She did not compete with either partner internationally.
On June 10, 2010, Belbin and Agosto announced their retirement from eligible skating. Belbin said that in addition to touring professionally, she is interested in a career in broadcasting.