Thomas "Tom" Danielson (born March 13, 1978) is an American former professional road racing cyclist who most recently rode for UCI ProTeam Cannondale–Garmin, until a positive test for synthetic testosterone in August 2015 and Cannondale's decision not to renew his contract. He previously competed professionally for Discovery Channel (2005–2007), Fassa Bortolo (2004), Saturn (2003) and Mercury (2002).