What is a dissertation vs. thesis? Are they the same thing? I'm so confused

Inessa

Inessa

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Mar 6, 2026
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I thought I understood this but now I'm not sure. What's the difference between a dissertation and a thesis? I hear people use them interchangeably but also sometimes they seem like different things.

From my research (asking older students and Googling), here's what I've gathered:

In the US:
  • Thesis usually refers to a master's degree final project. Shorter, maybe 50-100 pages. Shows you can do research but doesn't have to be "original contribution to the field."
  • Dissertation is for PhD. Much longer (200+ pages). Requires "original research" that adds something new to your field. This is the terrifying one everyone talks about.
In Europe and some other places:
  • It's often reversed. Thesis can be for PhD, dissertation for master's. Or they're used interchangeably. No wonder I'm confused!
At the undergraduate level:
  • Some schools have "senior thesis" or "capstone project." Similar idea but smaller scale. Like a practice dissertation.
What they have in common:
  • Both are major research projects
  • Both require you to work independently with a advisor
  • Both take months or years
  • Both involve research, writing, and a defense (presentation to a committee)
So the main difference is level: thesis = master's, dissertation = PhD. At least in the US. But also sometimes not. I'm still confused honestly.

Can anyone clarify? How do you explain this to someone who's just starting to think about grad school?
 
The US/Europe flip is so annoying and I wish everyone would just pick one 😭

But here's how I remember it: in the US, PhD = Doctor = Dissertation. They both start with D. Master's = Thesis = T. No D. Dumb but works for me.

Also important: dissertations have a "defense" where you present to your committee and they grill you. Most master's theses have a defense too but it's usually more chill. My friend's master's defense was basically a conversation. My PhD defense prep nearly killed me. Different worlds fr.

Anyway you got this! Just check your program's requirements.
 
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