Alwin de Prins (born 29 October 1978) is a former competitive swimmer who represented Luxembourg.

Born in Dendermonde, Belgium, he first represented Luxembourg in 1995 at the European Championships in Vienna.

His trainers were Klaus Juergen Ohk and Ingolf Bender (federation coach).

De Prins is a member of the board of directors and the Technical Commission of the Luxembourg Swimming Federation as well as member of the Athletic Commission of the Luxembourg National Olympic Committee.

In September 2008 he announced his retirement from competitive swimming on his blog.