Tiffany Williams (née Ross; born 5 February 1983 in Miami, Florida) is an American hurdler who is a former US 400m hurdles champion in 2007 and 2008.

She had a standout collegiate career at the University of South Carolina, as SEC champion 3 years in a row and a 15 time all American.

[1] In addition she won a silver medal in 4 x 400 metres relay at the 2006 World Indoor Championships.

[2] Her personal best time for the 400 m hurdles is 53.28 seconds, achieved in June 2007 in Indianapolis.

Williams returned to form in 2012 running 55.01 her fastest time in 3 years in a meeting in Turkey.