Luc René Decker (born 3 March 1977 in Luxembourg City) is a Luxembourgish former swimmer, who specialized in butterfly events.

[1] He represented his nation Luxembourg at the 2000 Summer Olympics, and held three Luxembourgian records in all butterfly distances (50, 100, and 200 m).

He achieved a FINA B-cut of 55.93 from the European Long Course Meet in Luxembourg City.

[3] He challenged seven other swimmers in heat three, including Kyrgyzstan's Konstantin Ushkov, silver medalist for Russia in Atlanta four years earlier, and Uzbekistan's top favorite Ravil Nachaev.

[4] Since his retirement came after the Olympics, Decker completed his master of science degree in political economy at Paris-Sorbonne University, and later worked for investment promotion at the Ministry of the Economy and Foreign Trade in Luxembourg.