Shield Investigations
“Very helpful and fast response I called to find a lost brother and they helped me even though I'm on disability they waved the charges and still put the time in for me”
Best Private Investigators near Cambridge, MA
These agencies serve Cambridge from nearby bases in towns including Boston, Everett and Somerville.
15 agencies listed · 6 open 24/7 · 9 open weekends · 11 rated 4.5+ · 4 show a license
Data verified October 28, 2026
American Investigative Services
“AMI, very professional, experienced, great to work with, receptive and constant communication with us.”
New England Security & Protective Services Agency
“We also did a marketing campaign and activation with a street team in and around greater Boston and New England Security once again provided a knowledgeable and professional security team to escort our production crew.”
Kraft Investigations Group
“Marty and his team are the best in the business!”
Dinatale Services
Bob Long Investigations and Security Consulting Group
“Bob and his team of highly professional individuals tracked the item down and convinced the individual who forgot to turn the item into lost and found, to hand it over.”
The 15 agencies on this page are the private investigators listed for Cambridge, MA. What each one states about its license, its specialties and the areas it covers comes from its own website; ratings and quotes come from public reviews.
Area overview: Cambridge, MA
14 of the 15 agencies on this page have a rating, from 4.0 to 5.0 across 71 reviews; 11 are rated 4.5 or higher. 6 are open around the clock; 9 are open on Saturdays and 8 on Sundays. 4 show a license on their websites and 3 have a BBB rating of A or A+. Domain records put 10 websites of the agencies on this page at ten or more years old; the oldest dates from 1997. 6 offer urgent consultations; 2 offer a free initial consultation and 1 is family- or locally-owned. We have a website on file for all 15 of the agencies on this page; 14 publish a contact page and 10 list a public email. We count these figures across the agencies on this page; hours and prices change, so confirm the details with the agency before you book.
Do investigators listed for Cambridge discuss a case free?
2 of the 15 agencies state that a first consultation costs nothing. Use it to describe the problem and hear whether the work can be done lawfully at all. A straight agency will sometimes tell you on that call that what you want cannot be obtained, which saves you a retainer.
Vaglica Investigations
“I was being harassed and threatened almost every single day this year until Jill Vaglica PI found out that I wasn't the only one and that I was dealing with a vexatious litigious person who had me in the crosshairs.”
Owl Eye Investigations
“I could not have been more satisfied with the service I received from Owl Eye.”
Nardizzi & Associates
“Thanks for the help from these investigators in Boston, I was able to find out the truth about someone from some old criminal records.”
Ameriguard Protective Services
NWI Investigative Groups
Metropolitan Protective Service
Michael B Fixman Constable
Sannecure
Boston Computer Forensics
Why these companies made our list
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