Ulf Tobias Enström (born 5 November 1984) is a Swedish professional ice hockey defenceman, currently playing for and an alternate captain of the Atlanta Thrashers of the National Hockey League (NHL).

Growing up in Nordingrå he played hockey in Höga Kusten Hockey but moved to Örnsköldsvik and Modo Hockey when he got accepted to the Hockey high school playing for Modo J18. After two second places with Modo's J18 he advanced to Modo's J20 and later to the Elitserien team. He comes from a hockey family where both of his brothers, Tommy Enström and Thomas Enström, as well as his sister Tina Enström, all are or have represented various teams within the Modo Hockey organization.

Following a successful rookie season during his first year in Elitserien, where he was elected Rookie of the Year, he was drafted in the 2003 NHL Entry Draft by the Atlanta Thrashers, in round eight as pick number 239 overall. He won the 2006/2007 Swedish Elite League championships with Modo Hockey and finished first in assists in the playoffs.