CPI Security Services
“I have worked with CPI on a personal level and have to say that they are hands down an extremely friendly, accommodating , professional company with years of service in the industry.”
Best Private Investigators near Oshawa, ON
None of these agencies is based in Oshawa; they work from towns including Toronto (46 km), North York (43 km) and Markham (33 km).
24 agencies listed · 14 open 24/7 · 20 open weekends · 19 rated 4.5+ · 6 show a licence
Data verified October 18, 2026
Investigative Solutions Network
“Got my certified fingerprints and police check done and the experience was pleasant.”
Canguard Security & Investigations
Pipro | Private Investigators Scarborough
“They communicated with me through out the whole process.”
Investigations Toronto
“I dealt with Bryan and he was very helpful.”
Protect First Security Services
“Our guard arrived early both nights for his shift & stayed onsite until we arrived the next morning.”
The 24 agencies shown for Oshawa, ON carry out investigation work: surveillance, tracing, background and asset inquiries. Details of licence, specialties and coverage come from each agency's own website, and ratings and quotes come from public reviews.
Area overview: Oshawa, ON
23 of the 24 agencies on this page have a rating, from 4.0 to 5.0 across 872 reviews; 5 have 50 or more reviews and 19 are rated 4.5 or higher. When clients rate these agencies on specific qualities, they most often praise professionalism (90%), responsiveness (81%) and quality (71%). The topics that come up most in reviews of the agencies on this page are "results" and "efficient". 14 are open around the clock; 20 are open on Saturdays and 18 on Sundays. The services the agencies on this page list most often on their websites are corporate investigations (4), surveillance (4), insurance investigations (3), cheating spouse investigations (2) and insurance fraud investigations (2). 6 show a licence on their websites. Domain records put 13 websites of the agencies on this page at ten or more years old; the oldest dates from 1996. 14 offer urgent consultations and 8 offer a free initial consultation. We have a website on file for all 24 of the agencies on this page; all 24 publish a contact page and 21 list a public email. We count these figures across the agencies on this page; distances are straight-line, and hours and prices change, so confirm the details with the agency before you book.
Do investigators listed for Oshawa discuss a case free?
8 of the 24 agencies say an initial consultation is free. Treat it as a scoping conversation about what you want to know and whether privacy law permits it to be collected. A firm that says no at that stage has just spared you a retainer and a useless report.
Investigative Power
Invictus Investigations
“Really impressed with Joe and he's team they are were very professional and provided us with the information we were requesting in a timely matter.”
Investigator 911
“I had the case and the investigators helped me with my issues in a timely manner keeping me updated every week”
Mantis Investigation Agency
Investigation Hotline
“Less than 24 hours, he had results for us that were imminent to the case at end, and he has been of nothing but help.”
The Investigators Group
“These guys do a great job and care about theft as if it was their own store .”
Ontario Wide Process Servers
“Ontario Wide Process Servers went above and beyond to help me serve process for a cross border divorce.”
Discreet Investigations Toronto | Private Investigator Company
“These have to be the best people to reach out to in case you need anything investigated.”
Intrepid Investigations
“They are quick to respond, provide great results and keep me updated throughout the assignment.”
Vest Security Services
“Highly professional employees of this company.”
Haywood
“Incredibly supportive company that took the time to sit with us and understand our situation.”
Intel Group Investigation Services
“Intel Group investigation services was very professional and discreet and gave me the closure I needed.”
Regent Private Investigations
“They were extremely professional and gave me peace of mind in dealing with my situation.”
Premiere Investigations
“I have had the pleasure in using premiere investigations in a few occasions with some employees issues, they are very professional and very good at what they do.”
Ascent Intelligence Agency
“His good work stopped 14 years of constant court appearances as the judges now had the proof I had been telling them all along”
Fine Line Investigations
“Working with this company allowed us to obtain a positive resolution.”
Atlas Private Investigations
“Will definitely recommend or if need be use their services again.”
First Recon Private Investigators
“They were extremely professional and sensitive to my situation, their fees were reasonable, and the personalized service was amazing.”
Why these companies made our list
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