Best Private Investigators in Singapore (2026)

Hiring a private investigator is usually not something people do casually. Most clients are dealing with sensitive situations, whether it involves matrimonial concerns, employee misconduct, missing persons, corporate due diligence or evidence gathering for legal matters. Because of that, the best private investigators in Singapore are not simply the ones with dramatic claims. They should be licensed, discreet, legally compliant and clear about what they can and cannot do.

In Singapore, private investigation is regulated. The Singapore Police Force states that private investigation agencies require a Private Investigation Agency Licence, and individual private investigators must also be licensed.

1. Baker St Private Investigator

Baker St Private Investigator is one of the more visible private investigation agencies in Singapore. The agency offers 24/7 PI services for legal, personal and corporate clients.

Its appeal lies in the breadth of services. Clients looking for matrimonial investigations, surveillance, legal evidence support or corporate investigation work may prefer an agency that handles several case types rather than one narrow niche.

Best for: All-round private investigation services
Services: Matrimonial, personal, corporate and legal investigations
Website: https://bspi.sg/

2. Ace Private Investigations

Ace Private Investigations describes itself as a Singapore private detective agency with over 19 years of experience. The agency highlights work involving individuals, companies, court-related evidence gathering and private investigation matters.

This makes it a practical option for clients who want an experienced local PI agency that understands both personal and corporate investigation needs.

Best for: Experienced investigation work
Services: Surveillance, matrimonial, corporate and evidence gathering
Website: https://acepi.com.sg/

3. Asia Top Investigation

Asia Top Investigation is notable because of its long-standing presence in Singapore’s private investigation industry. The agency focuses heavily on legal, professional and commercial investigation support.

This makes Asia Top Investigation especially relevant for complex cases where legal process, documentation and professional handling matter.

Best for: Legal and complex investigation cases
Services: Matrimonial, commercial investigation, raids and legal support
Website: https://asiatopinvestigation.com/

4. Kokusai Security / Catch Cheating Spouse

Kokusai is one of the longer-established names in Singapore’s private investigation scene. The company is particularly associated with matrimonial investigations and infidelity-related cases.

The agency has been operating for decades and is especially known for discreet surveillance work connected to relationship matters.

Best for: Matrimonial investigations
Services: Surveillance and private investigation
Website: https://privateinvestigatorsingapore.com.sg/

5. International Investigators

International Investigators positions itself around discreet investigation work for both personal and corporate clients.

The agency may appeal to clients who need confidential investigation support or more sensitive cross-border-related cases.

Best for: Discreet and cross-border-sensitive cases
Services: Private, corporate and covert investigations
Website: https://www.intlpi.com/

6. Eyes Private Investigators

Eyes Private Investigators positions itself around expert private detective services in Singapore and mentions former police officers with years of experience.

That background can be reassuring for clients who want investigators familiar with evidence handling, lawful boundaries and practical fieldwork.

Best for: Clients who value former enforcement experience
Services: Surveillance, background checks, matrimonial and commercial investigations
Website: https://www.sgprivateinvestigators.com/

7. Krows Investigation

Krows Investigation offers licensed investigation support for corporate, personal and surveillance needs.

This may suit clients who need both individual and business-related investigation support, especially when discretion and documentation are important.

Best for: Corporate and personal investigations
Services: Surveillance, due diligence and private investigation
Website: https://www.investigation.com.sg/

8. Nemesis Investigations

Nemesis Investigations is among the more established private investigation agencies in Singapore and has been operating for many years.

This is a suitable name to shortlist if you are comparing experienced agencies rather than newer operators.

Best for: Established agency support
Services: Private and corporate investigation services
Website: https://www.nemesispi.com/

9. Ranger Investigation & Security Services

Ranger Investigation & Security Services combines private investigation with broader security-related services.

Because of the security-linked positioning, it may be more relevant for businesses, property-related cases or clients needing broader operational support beyond personal investigations.

Best for: Security-linked investigation needs
Services: Investigation and security services
Website: https://www.rangersecurity.com.sg/

10. Pedro Investigations & Security Services

Pedro Investigations & Security Services is another long-running name within Singapore’s private investigation industry.

The agency may appeal to clients looking for experienced investigators with a longer operational track record.

Best for: Long-running investigation support
Services: Private investigation and security-related services
Website: https://pedro.com.sg/

How to Choose a Private Investigator in Singapore

The most important thing is licensing. You should also ask what is included in the quote, how updates will be provided, whether reports are court-suitable, and what the agency cannot legally do.

Avoid any investigator who promises illegal access to phones, bank accounts, Singpass, private messages or restricted databases.

Final Thoughts

The best private investigator in Singapore depends on the nature of the case. For broad PI services, Baker St Private Investigator and Ace Private Investigations are strong starting points. For more legally complex matters, Asia Top Investigation stands out because of its long case history and professional positioning. For matrimonial cases, Kokusai remains one of the most established names.

Private investigation is sensitive work, so choose carefully. A good agency should be discreet, licensed, realistic and clear about legal boundaries from the beginning.