Datacenter or data center: which spelling is correct?

For general US English, write “data center” as two words. In UK English, write “data centre.” The one-word forms “datacenter” and “datacentre” are understandable, and some organisations use them as a house style or product term, but they are not the safest default for ordinary prose.

The difference is spelling, not technology. All four forms can refer to the same kind of facility: a building or dedicated space that houses computing, storage, networking, power, cooling, and security systems.

Key takeaways

• Use data center for a general US audience.
• Use data centre for a general UK audience.
• Use datacenter or datacentre when an organisation’s style guide, product name, or proper noun requires it.
• Do not switch between forms in the same document unless you are preserving a quoted name.
• The plural follows the same pattern: data centers, data centres, datacenters, or datacentres.

Data center, data centre, or datacenter?

Major dictionaries support the two-word distinction. Merriam-Webster lists “data center” as the US headword. Oxford lists “data centre” and identifies “data center” as the US spelling.

That does not make the closed compound “datacenter” an error in every context. Technical organisations sometimes establish their own terminology. The Microsoft Style Guide, for example, specifies “datacenter” as one word. A writer following Microsoft house style should therefore use the one-word form even though a general dictionary may prefer two words.

Is datacenter one word or two?

Both forms appear in real technical writing, but two words is the clearer general-purpose choice. Use “data center” in US English or “data centre” in UK English unless your organisation has chosen the one-word form.

This is a compound-noun question rather than a change in meaning. English compounds often begin as separate words and may become hyphenated or closed over time. Usage does not always change uniformly, so dictionaries, vendors, and internal style guides can disagree.

If you are editing a website or documentation set, consistency matters more than forcing every organisation into one universal spelling. Pick a default, record it in the style guide, and preserve official names exactly.

What is the difference between center and centre?

“Center” is the standard US spelling. “Centre” is the standard UK spelling and is also common in countries that generally follow British English.

The noun itself does not change. A data center and a data centre both describe a facility that supports computing infrastructure. The regional spelling applies to related phrases too:

• US English: data center operator, data center cooling, data center infrastructure
• UK English: data centre operator, data centre cooling, data centre infrastructure

How is data center spelled in Canada?

Canadian English often uses “centre” for the general word, so “data centre” is a natural editorial choice. Canadian technology organisations also use “data center,” particularly when following US vendor terminology. There is no technical distinction. Follow the publication’s own style and keep it consistent.

What does a data center do?

A data center houses systems that store, process, and move digital information. Depending on its purpose, it can contain servers, storage systems, network equipment, backup power, cooling, fire suppression, physical security, and monitoring tools.

Facilities vary from a small private server room to hyperscale campuses and specialised high-density sites for AI and scientific computing. The spelling does not identify the facility’s size, ownership, design, or tier. For a sourced comparison, see our guide to the world’s largest data centers by size and power.

How to choose the right spelling

Match your audience

Use US spelling for an American publication and UK spelling for a British publication. If the audience is international, choose the organisation’s established English variant.

Follow the house style

A company may deliberately use “datacenter” in product names, interface labels, or documentation. Treat that choice as a local rule, not proof that every other form is wrong.

Preserve proper nouns

Do not silently rewrite a company name, product name, certification, or quoted title. A document can use “data center” in its own prose while preserving “Datacenter” inside an official name.

Be consistent across metadata and copy

Use the same default in the page title, description, headings, body copy, image alt text, and internal anchor text. Search engines understand the variants, so a readable, consistent page is more useful than awkwardly repeating every spelling.

Spelling is separate from the larger data-center debate

Questions about energy use, water consumption, hardware lifecycles, and infrastructure design deserve their own evidence. They should not be used to avoid a straightforward language answer. For that broader subject, see our separate look at data centers and cloud-storage infrastructure.

Frequently asked questions

Which spelling is correct: data center or datacenter?

For general US English, “data center” is the safest default. “Datacenter” is also used by some organisations and is correct when their house style or a proper noun requires it.

What is the British spelling of data center?

The usual British spelling is “data centre.” Some organisations use “datacentre,” but the two-word form is the clearer general default.

Do data center and datacenter mean different things?

No. The spelling alone does not signal a different type of facility or service.

Should a website target every spelling variant?

Write naturally for the intended audience and use one consistent house style. You can explain the common variants once without forcing all of them into every heading.

Is data center capitalised?

It is normally lowercase unless it begins a sentence or forms part of an official name or title.