Group One Investigations is an investigation agency with strategic partnerships across the globe. We have a team of professional forensic investigators that specialise in domestic and corporate investigation services.  We have a far reaching network across Australia and Internationally whether you are looking for a private detective in Australia or overseas.

We also offer services to our clients that allows our team to handle the entire job from start to finish. For example, a private investigator in Victoria can conduct work for you interstate or even overseas. We provide this service to our valued clients in corporate or domestic matters.


Please take a moment to read the testimonials below.


" Great result and price"  J. Li


" Best Melbourne Private Investigators I've come across" Matt C


 " To all at Group One Investigations, thank you so much for all of your work in helping me reunite with my family, I tried many different companies but you are the only ones that went the extra mile and as a result i'm in touch with my family agian" Karren


"Thank you to everyone at Group One Investigations, your assistance during my difficult personal times was much appreciated,the results helped with closure." Aaron


 " I'm very please with the efforts the Group One Investigators put in on my job, it was a job requiring a private investigator Melbourne and Sydney they were able to assist in both states, very impressed"  Walter B


"I pleased to recommend the services of Group One Investigations, not only were their prices very reasonable the service and results were fantastic. " K. A


" Hiring a private detective was a first for me, not only was I impressed with the service, the investigators showed real dedication to the job, after i initally made inquiries for costs and services with various other firms contacting Group One Investigations was the best thing I did, the price and service was a standout, being in direct contact with the private detective that handled my case from start to finish also made me feel at ease." Bob