The first was reported near the intersection of Edinburgh and Kortright roads at around 3:30 p.m.
Police said a Toyota Rav 4 left the scene before police arrived.
The second crash was near Stone and Edinburgh roads at around 5:30 p.m.
According to police, a vehicle was driving westbound when a dark pickup truck turned left, causing a collision. The truck then continued into a plaza but was gone when officers arrived.
No injuries were reported by police in either crash.
Anyone with information into these crashes is asked to contact Guelph police at 519-824-1212.