Silviu Simioncencu (born December 13, 1975, in Crişan, Tulcea) is a Romanian sprint canoer and three-time world champion in the Canadian canoe events.

Simioncencu was also a member of Romania's C-4 500 m crew which crossed the line second but was later awarded the gold medal after Russian Sergey Ulegin failed a doping test.

At the Athens Olympics Simioncencu and Popescu were unlucky to miss a medal, finishing fourth in both C-2 finals (500 m and 1000 m).

In 2005, despite having changed two crew members, the Romanians retained their European C-4 title and went on to win the World Championship gold medal at Zagreb.

At the World Championships in Szeged, Hungary, however the Romanians had to settle for the bronze medal behind Belarus and Poland.