The two terms get used inconsistently across countries and even across departments at the same university, which is exactly why it's worth checking your own program's specific definition before assuming either word tells you the actual requirements.
| Region | Master's Degree | Doctoral Degree |
|---|---|---|
| United States | Thesis | Dissertation |
| United Kingdom / much of Europe | Dissertation | Thesis |
| Australia | Varies by institution | Thesis |
Notice the US and UK conventions are essentially reversed. A major source of confusion for international students or anyone reading both American and British academic sources.
Part of the confusion is genuinely etymological, not just inconsistent usage. "Dissertation" comes from the Latin dissertatio, meaning a discourse or discussion, while "thesis" comes from the Greek thesis, meaning a proposition put forward to be proven. Historically, both words described the same basic act, presenting and defending a position, which is exactly why they were never cleanly split by degree level in the first place. The US and UK simply standardized the same two words onto opposite ends of the degree ladder over time, and neither convention is more "correct" than the other.
This matters practically because a student reading published research across both traditions, which is nearly everyone doing a literature review, will encounter both words used for what is functionally the same kind of document, depending on where the author studied. Recognizing the regional split prevents a common and avoidable misreading: assuming a UK "thesis" citation is describing lighter work than a US "dissertation," when the opposite may well be true.
| Country / Region | Common Usage |
|---|---|
| United States | Thesis (master's), dissertation (doctoral) |
| United Kingdom | Dissertation (master's/undergraduate), thesis (doctoral) |
| Canada | Mixed. Often follows US convention, but varies by institution and even by department |
| Australia | Thesis used at both master's (research) and doctoral level; "dissertation" less common |
| South Africa | Generally follows UK-style convention |
| India | "Thesis" widely used at both master's and doctoral level; "dissertation" used more loosely, often for shorter projects |
| Non-English-speaking Europe | Local-language equivalents vary by country and don't map cleanly onto either English convention |
The practical takeaway from this table is the same regardless of country: regional convention is a starting orientation, not a substitute for your own program's stated requirements, which is why the next section focuses on what actually differs in substance rather than in label.
Check your own program handbook, not general definitions. Regional convention is a rough guide, but your specific institution's requirements, page count, originality expectations, committee structure, are what actually governs your project. The label matters less than the substance behind it.
Consider two doctoral students starting the same year: one enrolled in a US-based EdD program, the other in a UK-based PhD program. The American student's institution calls the final project a "dissertation"; the British student's institution calls it a "thesis." On paper, the terminology looks entirely different. And a student unfamiliar with the regional split might assume the two projects bear little resemblance to each other.
In practice, both projects require an original contribution to the field, both go through a multi-chapter structure covering a literature review, methodology, findings, and discussion, and both conclude with a formal defense before a committee (called a "viva voce" in the UK, an oral defense in the US). The word used in the university's paperwork tells you almost nothing about the substance of what's required. The degree level and the specific program's handbook tell you everything that actually matters.
This is the practical lesson behind the terminology confusion: don't let the label do work that only your program's actual requirements document can do. If you're unsure which set of expectations applies to your project, checking your handbook, or asking your advisor directly, resolves the question far faster than reasoning from general regional convention.
Once you know which term your own institution uses, the practical rule is simple: use that term consistently across your document, your CV, and any correspondence with your committee, and don't switch to the "other" word just because you've seen it used elsewhere in the literature. Mixing terms within your own dissertation, calling it a "thesis" in the acknowledgments and a "dissertation" in the abstract, reads as inattentive proofreading even though the underlying confusion is genuinely widespread and understandable.
When citing sources from the opposite convention, a UK thesis in a US dissertation's literature review, for example, there's no need to "translate" the term in your citation; reproduce the source's own title and terminology exactly as published, and use your own institution's term only when referring to your own document. This is also worth keeping in mind when searching databases: a search limited to "dissertation" as a keyword can silently exclude a large body of relevant UK-convention "thesis" records, and vice versa, so search both terms regardless of which one applies to your own project.
Dissertation, thesis, or capstone. Support matched to your program's actual requirements.
No. We support both master's and doctoral-level projects, whatever your institution calls the requirement, including thesis support for master's students.
Generally yes, but this varies significantly by field. A quantitative psychology dissertation and a humanities dissertation can differ enormously in length even at the same degree level.
These often use the term "dissertation" or "capstone" and tend to emphasize applied practice contributions over purely theoretical ones. See our DNP/EdD capstone guide for more detail.
Use whichever term your actual institution used on your official transcript and diploma. That's the version that matches your verifiable academic record. You can add a brief clarifying phrase (e.g., "doctoral dissertation, equivalent to a PhD thesis") if you're applying somewhere the other convention is standard and want to avoid any ambiguity.
No. Formatting requirements (margins, headings, citation style) come from your institution's style guide, not from whether the document is called a thesis or a dissertation. See our formatting and style guide for the requirements that actually govern the document regardless of what it's titled.
No. The originality bar tracks degree level, not terminology. A UK master's "dissertation" and a US master's "thesis" carry a broadly similar originality expectation to each other, just as a UK doctoral "thesis" and a US doctoral "dissertation" do. It's the degree, not the label, that sets the bar.
Some professional and applied doctoral programs deliberately avoid both "thesis" and "dissertation" to signal that the project is oriented toward solving a workplace problem rather than producing purely theoretical research. The underlying expectations, rigor, a defensible methodology, committee approval, are typically comparable; only the emphasis and, often, the audience for the final product differ.