Is “In” Capitalized in a Title?
A clear guide on when to capitalize or lowercase “in” in headlines, titles, and subtitles across Chicago, AP, APA, and MLA styles.
Quick Reference Examples
| Example Title | Correct Form | Grammatical Rule |
|---|---|---|
| A Walk in the Park | A Walk in the Park | Preposition in middle of title (lowercase) |
| The People in the Room | The People in the Room | Preposition linking nouns (lowercase) |
| In the Beginning | In the Beginning | First word of title (always capitalized) |
| The Doctor Is In | The Doctor Is In | Adjective / predicate adverb (capitalized) |
| Getting In Over My Head | Getting In Over My Head | Verb particle (capitalized) |
When “In” Stays Lowercase
In title case, short prepositions are treated as minor grammatical words. When “in” links a noun or pronoun to show location, time, or direction, it remains lowercase:
- A Day in the City
- The Man in the Iron Mask
- Alice in Wonderland
- Life in New York
- A Walk in the Woods
When “In” Must Be Capitalized
When “in” changes its grammatical function from a preposition to another part of speech, it is capitalized as a major word:
- Adjective: The In Crowd
- Adverb / Particle: Come In From the Cold
- Phrasal Verb: Ring In the New Year
- Noun (Influence): Have an In With the Boss
Position-Based Capitalization Rules
1. First Word of a Title or Subtitle
Every major style guide requires the first word of a title or subtitle to be capitalized, regardless of part of speech or character length:
- In Search of Lost Time
- In the Middle of the Night
2. After a Colon or Em Dash
When a subtitle begins after a colon (:) or dash (—), the first word is capitalized across title-case formats:
Example: The Great Debate: In Search of Answers
3. Last Word of a Title
Under Chicago, APA, and MLA styles, the final word of any title is capitalized even if it is a preposition:
Example: Who Did You Turn In?
Rules by Style Guide (Chicago, AP, APA, MLA)
| Style Guide | Rule for “In” as a Preposition | Preposition Length Threshold |
|---|---|---|
| Chicago Manual of Style | Lowercase in middle of title | All prepositions lowercase (unless 1st/last word) |
| Associated Press (AP) | Lowercase in middle of title | Prepositions of 3 or fewer letters lowercase |
| APA Style | Lowercase in middle of title | Words of 3 or fewer letters lowercase |
| MLA Style | Lowercase in middle of title | All prepositions lowercase regardless of length |
Frequently Asked Questions
Is “in” capitalized in a title?
Usually, “in” is not capitalized when it is used as a preposition in the middle of a title. However, “in” is capitalized when it is the first or last word of a title, or when it functions as an adjective, adverb, particle, or noun.
Is “in” capitalized at the beginning of a title?
Yes. The first word of any title or subtitle is always capitalized across all style guides regardless of its part of speech.
Is “in” capitalized in APA title case?
In APA style, “in” is lowercased when used as a preposition in the middle of a title because it has three or fewer letters.
Is “in” capitalized after a colon?
Yes. In standard title-case formatting, the first word of a subtitle following a colon or em dash is always capitalized.