Louk Sorensen (born 7 January 1985) is an Irish former professional tennis player.
Sorensen was the first player representing Ireland to win a Grand Slam event main draw match in the Open Era.
His father, Sean, was the first Irishman to play a Grand Slam main draw match in the Open Era, going out in the first round of Wimbledon.
(Matt Doyle reached the fourth round of the US Open in 1982 but played under the American flag then, only becoming an Irish citizen in 1985).
Since retiring from playing, Sorensen has begun coaching and currently coaches Australian player John Millman.