Koen Smet (born 9 August 1992) is a Dutch athlete specialising in the sprint hurdles.
He won a silver medal at the 2013 European U23 Championships.
In addition, he represented his country at two World Indoor Championships reaching the semifinals in 2018.
His personal bests are 13.58 seconds in the 110 metres hurdles (-0.4 m/s, Tampere 2013) and 7.65 seconds in the 60 metres hurdles (Magglingen 2018).