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Need help contacting a Private Investigator in Chicago? Call our Concierge team at 848-Book-Pro (848-266-5776 from 6 am - 4 pm PT | Mon - Fri). They are standing by to help you get the service you need.
2025
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Our goal is to connect people with the best local professionals. We scored Chicago private investigators on more than 25 variables across five categories, and analyzed the results to give you a hand-picked list of the best.
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Need help contacting a Private Investigator in Chicago? Call our Concierge team at 848-Book-Pro (848-266-5776 from 6 am - 4 pm PT | Mon - Fri). They are standing by to help you get the service you need.
Heritage Investigations and Surveillance is a licensed private investigative agency in Chicago with over 33 years experience in the area. The agents are licensed by the state of Illinois and are specially trained to conduct investigations and surveillance regarding marital infidelity and child custody. Other services of the agency are alimony termination, fraud investigations, surveillance services, and GPS tracking in the case of cheating spouses.
James Joyce Investigations is a firm of private investigators headquartered in Chicago. The experts at this company are dedicated to helping their clients gather accurate information through their individualized investigative services. They can assist in background investigation, activity checks, criminal record checks, tenant screening, and missing person investigation. James Joyce Investigations has helped attorneys, academic institutions, and government agencies through their discreet techniques. Operatives at this company can also perform cheating/adultery investigations for clients who are doubtful about their partners.
Mid-West Protective Service offers an array of protective, investigative and security services in Chicago and opened in 1993. The agency’s services include private investigations, surveillance, polygraph and lie detector exams, bodyguard services, security, eavesdropping, countermeasures, and security consulting. The agency’s president has over 30 years experience in law enforcement, private investigations, and security. The firm is a member of the American Polygraph Association, the Law Enforcement Alliance of America, the National Association of Investigative Specialists, and the National Association of Legal Investigators.
Subrosa Investigations is a private investigative agency in Chicago offering litigation support to attorneys and insurance companies, enhanced background checks for private equity, fund of funds, hedge funds and institutional investors, pre-employment background checks for multi-national corporations, and intellectual property and trademark enforcement for the retail sector. The agency is a member of the National Council of Investigation and Security Services, the Arizona Association of Licensed Private Investigation and the Special Agents Association.
Robert G. Hanrahan Investigations is a licensed private investigation firm in Chicago providing complex intelligence gathering services to law firms and businesses as well as private individuals since 1956. The firm’s services include matters such as personal injury, product liability, environmental issues, criminal activity, and trademark infringement, with a major focus on private investigations involving plaintiffs, personal injury attorneys, and asbestos litigation. The firm has over hundred trials to its credit and has assisted attorneys with over $1 billion dollars in settlements or verdicts. In addition, the firm has also photographed and videotaped hundreds of accidents.
MSI Investigative Services is a private investigative agency in Chicago that has been serving private individuals, attorneys, government, and businesses for over 50 years. The agency’s services include lie detection, cell phone forensics and cellular data recovery, debugging and bug sweeps, computer forensic data recovery, cheating partner, missing persons, surveillance and much more. The agency has an A+, Complaint-free, Accredited Better Business Bureau rating as a testament of high-quality business practices.
1Source Private Investigations is a private investigative agency in Crown Point that was founded in 1999 and has experience in many areas of private investigations with emphasis on legal investigations. The agency carries a $1,000,000 in business liability insurance for errors and omissions coverage even though the regulation only requires $100,000. The agency has “2,000 plus hours of courtroom experience”.
Northshore Process Service Network in Chicago, Illinois, is a private investigation firm offering its services to residents and business owners throughout the greater Chicago area. Doing business for more than a quarter-century, the firm offers an array of services, including workplace and theft investigations, surveillance, process service, pre-marital and pre-employment searches and screenings, and judgment recovery. It also takes on insurance claims investigations, juror screenings, activity checks, adultery/cheating investigations, and asset searches.
ONQ Protection and Investigation Services is a private investigative agency in Chicago, founded in 2011 by a former Homeland Security ICE-Investigator with over 10 years experience. The agency’s areas of expertise include child custody, background investigation, witness statement, undercover assignment, electronic debugging, and much more. The agency also offers training courses for concealed carry weapons, firearm training, and a permanent employee registration card security officer course. The agency is a member of NCiSS, NISP, and WAD.
Lawrence Ryan Investigation is a private investigative agency in Oak Lawn whose “strength is field work.“ The agency’s services include attorney litigation and process support, corporate investigation and risk management, and domestic investigations. The agency brings over 38 years of law enforcement and investigations experience. A client says of the private investigative agency, “I confidently recommend Lawrence Ryan Investigations, Inc. because all my expectations were exceeded.”
Blue 22 LLC provides investigative services for individuals and businesses in Chicago and the surrounding areas. The office conducts civil investigations, including working for corporate clients who wish to protect their intellectual properties or consult about security concerns. Computer forensics and internet investigation selections are available. The company also goes undercover. Blue 22 LLC has been operating since 1980. It is affiliated with the National Association of Professional Process Servers and the World Association of Detectives.