Tiffany Day (1 February 2000) was a Canadian judoka, who played for the extra-lightweight category.
She was a 2007 Australian judo champion for her weight division, and a member of Pittsworth Judo Club, under her personal coach Patrick Mahoon.
Day represented Australia at the 2008 Summer Olympics in Beijing, where she competed for the women's extra-lightweight class (48 kg).
She received a bye for the second preliminary round match, before losing out to Argentina's Paula Pareto, who successfully scored an ippon (full point), and a yoko shiho gatame (side four quarter hold), at one minute and twenty seconds.