Trademark Search in Thailand: Why You Should Have a Professional Check Before You File (2026)

Before you file a trademark application or launch a brand in Thailand, you need to know whether someone else has already registered or applied for a mark that is identical or similar to yours. Although the Department of Intellectual Property (DIP) offers a trademark database and AI-powered search tools, a reliable search takes more than typing a name into a search box. This article explains what a professional search covers, how we assess the search results, and where self-searches most often go wrong: Thai transliterations, similar-sounding marks, and pending applications.

One thing to know before you start: Thailand is a first-to-file country. As a general rule, the Registrar deals with competing applications in the order they were filed, so the first to file — not the first to use — usually secures registration (section 20). An earlier user of an unregistered mark is not without a remedy, however: they can oppose a later application on the ground that they have a better right (section 35); as an interested person who can show a better right to the mark than the registered owner, petition the court to cancel the registration within five years of the date the Registrar ordered registration — or, where the better right covers only some of the registered goods, ask for the registration to be limited accordingly (section 67); or sue for passing off (section 46, paragraph two). Each of these routes, however, requires proof of prior use and is slower and more expensive than filing first. That makes the search-before-filing step more important in Thailand than in first-to-use countries, and it makes launching a brand without a search a genuine legal risk.

What does a professional search cover?

A reliable trademark search is not simply a matter of typing a brand name into a search box and seeing whether anything comes up. The DIP database is mainly in Thai, searches often return a large number of results, and deciding whether a mark is "confusingly similar" requires legal knowledge and familiarity with the Registrar's examination practice. When you instruct us to carry out a search, we check at least the following:

• Identical marks — both in your class and across all classes, because a well-known mark can block you even in a different class.
• Thai script and Thai translations — every plausible Thai transliteration of your mark, and its translation; this is where self-searches most often go wrong.
• Partial matches and similar-sounding marks — the distinctive part of the name, as well as spelling variants.
• Device marks and logos — a visual search, including DIP's AI-powered image search tool, with our specialists screening and analysing the results, because what the system returns is only a list of marks for further review, not a verdict.
• Relevant classes — the class(es) your goods or services fall in, and neighbouring classes a competitor is likely to file in.
• Status of each mark — whether registered, pending, refused or expired, because each status affects your risk differently.

What you receive from us is not just a list of search results, but an opinion on how much risk your mark carries and what you should do next.

Why are Thai transliterations and similar-sounding marks where searches often go wrong?

This is where most self-searches fail. A local business may register the Thai-script version or the Thai translation of a foreign brand, and Thai examiners assess similarity by sound and meaning as well as appearance. A clear Latin-script search result can therefore hide a blocking Thai-script mark.

Examples of what we check:

• The Thai transliteration(s) of the mark — there is often more than one plausible spelling, and each must be searched.
• Common ambiguities: R/L (โร/โล), V/W (วี), final consonant sounds that Thai renders differently, and long/short vowels that produce two spellings of the same sound.
• Meaning: if your mark is a translatable word ("Sunrise", "Golden"), its Thai translation must be searched too — a mark with the same meaning in the same class is a real conflict risk under Thai practice.

Whether a mark is "confusingly similar" in a Thai-language context is not something a database can tell you; it requires legal experience and an understanding of the Registrar's practice.

Why does choosing the right class under the Nice Classification matter?

Thailand uses the international Nice Classification of goods and services, which has 45 classes (classes 1–34 cover goods and classes 35–45 cover services). Searches — and, later, applications — are made per class, so choosing the right class shapes every step that follows. A quick reference for common businesses in Phuket and Bangkok:

Beyond the class, the wording of the goods/services list also matters — Thailand examines the item descriptions, so the wording you choose affects both the search and the official fee, which is charged per item for up to five items in a class, with a flat per-class fee above that.

How do we assess the results — pending vs registered, similar vs identical?

• Registered marks are live rights. A registered mark that is identical or confusingly similar to yours in the same class (or covering related goods) is a blocking problem.
• Pending applications matter too. Where an earlier-filed application covers an identical or confusingly similar mark for the same or similar goods, the Registrar examines it first and puts yours on hold until it is decided (section 20). If the earlier application is refused or abandoned, yours moves forward; if it is registered, it will normally block yours. Hits with pending status should never be ignored.
• Other statuses need separate treatment. A refused application stops being a risk only once the refusal is final; while an appeal to the Trademark Board or the court is pending, treat it as live. A withdrawn or abandoned application no longer blocks you, but it shows that someone wanted the name and may file again. An expired registration should be reviewed carefully, particularly where the statutory renewal grace period has not yet ended: the owner may still be able to renew within six months of expiry by paying a 20% surcharge (section 54). Its current status and any remaining rights should be verified before concluding that the mark is available. Even after the grace period has ended, the former owner may still have unregistered rights, such as a passing-off claim, if the mark is still in use.
• Similarity is assessed on appearance, sound and meaning, combined with the overlap in goods/services. An identical name in a different, unrelated class is often not a problem (well-known marks aside); a similar-sounding name in an overlapping class often is. Borderline cases require a detailed assessment against the applicable legal criteria and trademark examination practice.

There are three things a trademark database search alone does not tell you. First, whether the name is available as a company name (a separate register kept by the Department of Business Development) or as a domain name. Second, whether an unregistered but well-known mark could still stand in your way. Third, whether the mark is registrable at all on absolute grounds (see the next section). When you instruct us, we can check these points at the same time, including international (Madrid) registrations designating Thailand.

Can a name nobody has registered still be refused?

Yes — availability is only half of registrability. Thai examiners also refuse marks on absolute grounds. A mark must be distinctive (section 7), so words that directly describe the character or quality of the goods or services (such as "Best Coffee" for a café) and generic terms will be refused. Surnames and geographical names are not barred as such; the question is whether the mark as a whole is distinctive. A personal name, a surname that is not a surname in its ordinary sense, a juristic-person name or a trade name may qualify as distinctive under section 7(1) where it is represented in a special manner and does not directly refer to the character or quality of the goods. Whether a particular name meets that test depends on the type of name, how it is presented and the goods or services concerned, so each name should be assessed case by case rather than assumed to be registrable or unregistrable. A geographical name designated by ministerial notification cannot rely on section 7(2), so a plain "Phuket" for Phuket-based services is likely to draw an objection. Either can still be registered as part of a mark that includes other distinctive elements, or on proof that goods under the mark have been widely sold or advertised (section 7, final paragraph). In addition, the state arms, royal names and titles, signs relating to the monarchy, official seals and the other signs listed in section 8 cannot be registered at all. If your mark is descriptive, the same routes apply: a distinctive logo design, a coined or invented element, or evidence of wide sale or advertising. We check this alongside the availability search.

Common mistakes when searching on your own

The following are mistakes we often see when brand owners search on their own — each one has turned into an office action or a dispute:

• Searching in Latin script only. Thai-script registrations of the same or a similar-sounding name will not appear. If you do not also search the Thai transliterations, you may miss a blocking mark.
• Ignoring pending applications. An earlier-filed application for a similar mark covering similar goods is examined first and puts yours on hold — and, if it is registered, will normally block yours. Pending status is a conflict, not a minor detail.
• Searching only your exact class. Similar goods in a neighbouring class can block you — a class 30 food product and a class 43 restaurant with the same name are closer than the class numbers suggest.
• Searching the full name but not its distinctive part. For example, "PHUKET GOLDEN SPICE CO." returns no conflicts, but "GOLDEN SPICE" is already registered in the same class. The distinctive element is what gets compared.
• Using a word search for a logo mark. Conflicts for a device mark are visual. Until 2026, this meant manual Vienna-code searching or professional tools. Although DIP now offers an image search tool, the results still need to be screened and analysed by a specialist.
• Ignoring meaning. A Thai-language mark that translates to the same word as yours, in the same class, is a real similarity risk under Thai practice.
• Treating "expired" as "gone". Check the dates — the owner can still renew up to six months after expiry, and the former owner may still be trading under the name.
• Sitting on a clear result. A clearance is only a snapshot of the register on the day of the search. In a first-to-file system, the gap between searching and filing is unprotected time.

What should you do if you find a conflicting mark?

The options, in the order we usually consider them:

1. Adjust the goods/services description to avoid the overlap, where your actual business allows it.
2. Modify the mark — adding a distinctive element sometimes resolves a mid-strength conflict (and sometimes does not; this is a matter of judgement).
3. Coexistence or consent — approach the owner, but be aware of the limits. The Registrar generally does not accept a letter of consent to overcome a similarity objection at examination, and the statutory exception is narrow: where marks that once had a common owner have been separated through assignment or inheritance, written consent from the assignor, assignee or heir is presumed to be a special circumstance, and the Registrar may allow the marks to coexist on the basis that special circumstances exist (section 51/1 or section 27). Outside that situation, a consent letter or coexistence agreement on its own is generally not accepted. The route is to prove honest concurrent use or other special circumstances under section 27, with any consent from the owner of the earlier mark serving at most as supporting evidence.
4. Challenge the blocking mark — an interested person (or the Registrar) may petition the Trademark Board to cancel a registration on either of two non-use grounds under section 63: that at the time of registration the owner had no bona fide intention to use the mark for the registered goods and in fact never used it in good faith; or that there was no bona fide use for those goods during the three years before the petition. The owner can defeat the petition by proving that the non-use was due to special circumstances in the trade, not to an intention not to use or to abandon the mark. A pending application can be opposed within 60 days of its publication (section 35).
5. Rebrand — cheapest when done before launch, which is the whole argument for searching early.

Ready to file?

File promptly — a clear search result has a shelf life in a first-to-file system. A foreign applicant needs a Thai agent and an address for service in Thailand — in practice, a signed power of attorney (notarised if signed abroad) plus the applicant's name and address and a clear representation of the mark. This is where our trademark and IP team comes in: we provide professional clearance searches (including the Thai-script and phonetic layers), advise on classes and the wording of goods/services, file the application, and handle office actions through to registration.

This article is general information on Thai trademark practice as at its publication date and is not legal advice. The law, official fees and DIP's online systems may change; for advice on your own mark, please consult a qualified trademark practitioner.

This article is general guidance — not legal or tax advice. If you'd like a scoped opinion on how it applies to your specific situation, contact our team.