Mississauga is a fairly safe city, however use common sense and vigilance at night like any other large city, as muggings can sometimes happen. The local police are friendly, trustworthy, and approachable, so any issues you have you can ask them for help.
On the weekend, clubs and bars in Mississauga can fill up with people fast. If you see a confrontation in a bar or club, it is best not to get involved, as these can escalate quickly.
For life threatening emergencies, dial 9-1-1 to be connected to Police, Fire, or Ambulance. For non-emergency inquiries, you can dial the following:
Mississauga Fire - 905-615-3777Peel Paramedic Services - 1-800-668-7821Peel Regional Police - 905-453-3311
On the whole, Mississauga is a safe city, and for the average tourist, you should have no problems.