The 5 Best Private Investigators in Bangkok [2025]

When you’re in a situation where you need answers or evidence, hiring a private investigator can be a game-changer. Whether it’s for resolving personal matters like infidelity or tackling corporate issues such as fraud, Bangkok has some of the best private investigators in the industry.

This blog highlights five top private investigator agencies in Bangkok, detailing their services, special features, and why they’ve earned a stellar reputation. If you’re searching for trustworthy, discreet, and efficient professionals, keep reading!

Why Hire a Private Investigator?

Private investigators offer valuable support in sensitive or complex scenarios. Here’s what they can help you with:

• Surveillance & Intelligence Gathering

They can track and monitor activities discreetly.

• Background Checks

Find out detailed information about individuals before making personal or business commitments.

• Corporate Investigations

Detect and prevent fraud, misconduct, or information leaks.

• Finding Missing Persons

Whether it’s a lost family member or someone avoiding commitments, they can locate individuals efficiently.

Now, let’s explore the top 5 private investigators in Bangkok that excel in these services.

1. Zele Private Investigators Thailand

Website: https://www.thailand-pi.com

Address: Q House Lumpini, 27th Flr, 1 S Sathon Rd, Bangkok 10120

Contact:

Tel: (+66) 02-648-5080

Email: help@thailand-pi.com

Operating Hours: Open 24/7

Zele Private Investigators is one of the most reputable agencies in Bangkok and Southeast Asia. They have an extensive local intelligence network and branches across countries like Vietnam, Indonesia, Malaysia, and Cambodia.

Core Services:

• Surveillance and background checks
• Finding missing persons
• Corporate investigations
• Serving legal documents
• Fraud investigation and document retrieval

Why Choose Zele?

Zele’s team comprises former police and military professionals, enabling them to tackle diverse and complex cases with precision. They’re highly commended for:

• Professionalism – Past clients like Maria Gonzalez, a business owner, praise their efficient service.
• Discreet Operations – John Doe, CEO of XYZ Corp, describes Zele’s work as discreet and impactful for corporate cases.

However, some feedback suggests they could improve client communication, especially when managing case updates. Despite this, their skilled team and proven track record make them a reliable option.

Pro Tip

If you need legal evidence or surveillance for international cases, Zele is an excellent choice.

2. Bangkok Private Investigators (Bangkok PI)

Website: https://bangkokinvestigators.com

Address: UnionSPACE, 30 Sukhumvit 61, Khlong Tan Nuea, Bangkok 10110

Contact:

Tel: (+66) 02-03-0604

Email: info@investigators.asia

Operating Hours: Open 24/7 (office visits by appointment only)

Famed for their discreet approach, Bangkok PI is a favourite among expats and businesses. Their clients often comment on their ability to provide detailed reports in clear, fluent English.

Core Services:

• Infidelity investigations
• Secret shopper services for businesses
• Background checks and fraud investigations

What Sets Bangkok PI Apart?

Their secret shopper service is brilliant for business owners looking to monitor employee performance. Plus, their payment flexibility (cash, PayPal, and bank transfers) is convenient for international clients.

Potential clients should note that Bangkok PI does not handle cases involving police, military officers, or political entities. Nonetheless, their extensive experience and ethical approach make them highly reliable.

Pro Tip

If you’re a business owner seeking professional-quality oversight, their secret shopper service can provide valuable insights to enhance your operations.

3. Lucky Lion Pride Co., Ltd. (Thailand PI)

Website: https://thailandpi.com

Address: Ploymitr Office Building, Floor 7, 81 Sukhumvit soi 2, Klongtoey, Bangkok 10110

Contact:

Tel: (+66) 02-255-0620

Mobile (English Support): (+66) 80-062-4243

Email: inbox@thailandpi.com

Operating Hours: Open 24/7 (appointments required for office visits)

Established in 1997, Thailand PI has been a trusted name in the industry for nearly three decades. Owned by an American-Thai couple, it boasts a small team of dedicated investigators.

Core Services:

• Background checks for expats and Thai citizens
• Surveillance for personal and corporate cases
• Security camera installations
• DNA testing and court paper services

Why Choose Thailand PI?

Their low-profile, family-run operation ensures every case receives personal attention. Past clients laud their dedication to finding the truth. However, larger criminal cases are not within their scope. They also employ extra discretion in cases involving sensitive parties.

Pro Tip

For relationship surveillance or discreet investigations with detailed reporting, Thailand PI is an excellent choice.

4. Detective Narong

Website: https://thai-detective.com

Address: Sutthisan Winitchai Rd, Din Daeng, Bangkok 10400

Contact:

Tel: (+66) 098-249-9939

Email: thaidetective168@gmail.com

Operating Hours: Monday to Sunday, 8 AM – 10 PM (appointment required)

Detective Narong is a standout choice if your case involves minor criminal investigations. With over 20 years of experience, this agency operates efficiently within a set timeframe.

Core Services:

• Infidelity cases
• Missing persons
• Corporate fraud surveillance
• Tracking persons with active arrest warrants

Why Choose Detective Narong?

They are known for their affordable rates and quick-turnaround times. Satisfied clients often recommend Detective Narong through word of mouth.

However, their operating hours (8 AM to 10 PM) may be restrictive for those requiring nighttime surveillance.

Pro Tip

Detective Narong could be a great choice if you’re looking for cost-effective services without skimping on professionalism.

5. Hanuman Guardian Solutions

Website: https://www.hanumanguardian.com

Address: PO Box 29 Phasi Charoen, Bangkok 10160

Contact:

Email: info@hanumanguardian.com

Operating Hours: Open 24/7 (appointments required for office visits)

Their efficient approach, stellar reporting, and cost-effectiveness make Hanuman Guardian Solutions a strong contender in Bangkok. They’re especially popular for cases requiring customised solutions.

Core Services:

• Surveillance and background checks
• Secret shopper services
• Corporate fraud investigations
• Missing persons and process serving

Why Choose Hanuman Guardian Solutions?

Clients praise their insightful reports and adaptive techniques. Despite being incredibly busy during peak seasons, they remain professional and efficient.

Pro Tip

Reach out in advance to ensure your case gets prioritised.

Find Answers with the Best Private Investigators in Bangkok

Bangkok offers several trustworthy and discreet private investigator services. From corporate investigations to personal surveillance, the investigators listed above are proven experts in their field.

If you’re a business owner or expat in need of professional and confidential support, reach out to one of these agencies—they’re only a call or click away.

Need expert help fast? Contact one of these leaders in private investigations and discover the truth today.