It Depends
Whether the word is capitalized in running text depends on placement; in a headline it is always capitalized. Run the headline through the titlecase converter to check the words around it too.
The Title Rule
"Professor" follows the same capitalization logic as "president," "senator," and "doctor." It's a title – and titles are capitalized when they work as part of someone's name, not when they describe a general role.
Write Professor Chen the same way you'd write Dr. Chen. The title functions like a first name in that position – it identifies a specific person. Remove the name and the capital letter usually goes with it: The professor assigned extra reading.
This is the single most common mistake with "professor." People capitalize it out of respect, but capitalization in English isn't about importance – it's about whether a word is functioning as a proper noun or a common noun.
Quick Rules
Capitalize when
- It's a title before a name: Professor Williams will hold office hours.
- It's used as a direct form of address: Thank you, Professor, for your feedback.
- It's part of a named/endowed position: the John Smith Professor of Law (official title)
- It starts a sentence (like any word)
Keep lowercase when
- It describes the role: She became a professor at 35.
- It follows a name: Emily Hart, professor of biology, published new findings.
- It refers to professors in general: The professors met to discuss the curriculum.
- It's used as an adjective: a professor's office, the professor emeritus
Tip: If you can swap "professor" with "teacher" and the sentence still reads the same way, it's being used as a description – keep it lowercase.
AP Style vs. Chicago Style
AP and Chicago agree on this one more than they disagree.
Both styles capitalize "Professor" before a name: Professor Angela Davis. Both lowercase it after a name or when used as a standalone description: the professor spoke at the event.
The small difference: AP style abbreviates most titles before names but does not abbreviate "Professor" – it's always written in full. You'd write Prof. only in informal contexts or tables, never in AP news copy.
Chicago is a bit more flexible. CMOS allows "Prof." as an abbreviation in running text when used before a full name, though spelling it out is always preferred.
For academic writing specifically, APA follows the same general rule – lowercase for descriptions, capitalize before names – and adds that you should generally avoid using courtesy titles like "Professor" in favor of full names on first reference.
Examples
✓ Do
- Professor Garcia teaches microeconomics on Tuesdays.
- The university hired three new professors this year.
- I emailed my professor about the deadline extension.
- Sarah Lin, professor of art history, curated the exhibition.
✗ Do not
The Professor canceled class today.
No name follows – it's a generic reference. Lowercase: The professor canceled class today.
She's a Professor of Mathematics.
Job description, not a title before a name. Lowercase: She's a professor of mathematics.
I asked professor Adams for a recommendation.
Title before a name must be capitalized: I asked Professor Adams for a recommendation.
Edge Cases Worth Knowing
These are the scenarios where "professor" causes the most hesitation – especially in academic writing and emails.
- "Prof." abbreviation. Capitalize and punctuate: Prof. Tanaka. In formal writing, spell it out: Professor Tanaka. Never use the abbreviation without a name following it.
- Professor emeritus. Lowercase "emeritus" in running text: professor emeritus, professor emerita. When used as a title before a name, capitalize the title portion: Professor Emeritus John Walker. Some institutions capitalize both words as an official designation – follow your institution's style if writing for an academic audience.
- Adjunct, associate, assistant. These modifiers stay lowercase when describing a rank: She's an associate professor. Before a name, capitalize: Associate Professor Diane Rivera. The full rank functions as the title.
- Visiting professor. Same pattern: a visiting professor from Berlin (lowercase) vs. Visiting Professor Hans Weber (before a name).
- Emails to professors. When addressing a professor directly – "Dear Professor Kim" – capitalize. In the body of the email, follow normal rules: As the professor mentioned in lecture... (lowercase, no name attached).
Frequently Asked Questions
Writing a heading with "Professor" in it? Our free Title Case Converter handles AP, APA, Chicago, and MLA styles automatically.
Open the converter with a prefilled example and adapt it to your headline.
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About Sophia Stewart
Sophia Stewart develops practical capitalization guidance for editorial and SEO workflows, with a focus on consistent rule application.
