Thomas Robert Hickey (born February 8, 1989) is a Canadian professional ice hockey defenceman who is a free agent. He previously played for the New York Islanders of the National Hockey League (NHL).
Hickey joined the Seattle Thunderbirds of the Western Hockey League (WHL) in 2004–05 in a limited role for 5 games. The following season, in 2005–06, he tallied 28 points as a rookie. In his draft year, in 2006–07, Hickey improved to 9 goals and 50 points. He was then drafted in the off-season by the Los Angeles Kings in the first round, fourth overall, in the 2007 NHL Entry Draft. On July 17, 2007, he signed a three-year, entry-level contract with the Kings.
On July 1, 2018, Hickey signed a four-year contract with the Islanders.