The 2008–09 Luxembourg Cup is the eighty-fourth season of Luxembourg's annual cup competition.
It began on 3 September 2008 with Round 1 and ended on 30 May 2009 with the Final held at a neutral venue.
CS Grevenmacher are the defending champions.
Forty of them competed in matches, with the other twelve teams were awarded a bye.
Bye: US Boevange, CS Bourscheid, FC Brouch, Vinesca Ehnen, Excelsior Grevels, FC Kopstal, AS Luxembourg-Porto, Marisca Mersch, US Moutfort, US Reisdorf, Résidence Walferdange, Yellow Boys Weiler The winners of Round 1 competed in this round.