Shield Investigations
“Tanya and Joe were excellent in helping me to resolve a difficult personal matter with limited clues.”
Best Private Investigators in Boston, MA
15 agencies listed · 6 in Boston · 6 open 24/7 · 9 open weekends · 11 rated 4.5+
Data verified October 28, 2026
Kraft Investigations Group
“Marty has been very helpful helping me locate someone I've been trying to find for months.”
Bob Long Investigations and Security Consulting Group
“He worked persistently from the moment I called until he found my niece, a missing person.”
Owl Eye Investigations
“I could not have been more satisfied with the service I received from Owl Eye.”
Metropolitan Protective Service
Boston Computer Forensics
The 15 agencies on this page are the private investigators listed for Boston, 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: Boston, MA
6 of the 15 agencies we list are based in Boston; the other 9 serve Boston from towns including Everett (7 mi), Brookline (3 mi) and West Roxbury (4 mi). 14 of the agencies on this page have a rating, from 4.0 to 5.0 across 73 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; distances are straight-line, and hours and prices change, so confirm the details with the agency before you book.
Why are investigation agencies outside Boston shown here?
6 of the 15 agencies have an address in Boston. The others come from other towns. Investigators travel to the subject, so an office one county over is rarely the issue. State licensing is the thing to check.
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.”
Dinatale Services
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.”
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.”
Ameriguard Protective Services
Summit Investigations
Michael B Fixman Constable
Sannecure
Why these companies made our list
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