Is "Who" Capitalized in a Title?

Yes. "Who" is a pronoun, either asking a question ("Who Moved My Cheese?") or introducing a clause ("The Man Who Knew Too Much"). Both uses are major words in title case, so every style guide capitalizes it.

"Who" by Style Guide

Style guide	"Who" mid-title	Why
AP	Capitalize	Pronouns are major words
APA	Capitalize	Pronouns are major words
Chicago	Capitalize	Pronouns are major words
MLA	Capitalize	Pronouns are major words
AMA	Capitalize	Pronouns are major words
Bluebook	Capitalize	Pronouns are major words

Examples in Chicago Style

• The Woman Who Sold the Moon
• Who Needs a Style Guide Anyway
• People Who Write for a Living
• The One Who Got Away

"Who," "Whom," and "Whose"

All three are pronouns, so all three are capitalized: "To Whom It May Concern," "Whose Line Is It Anyway?" The question words "what", "which", "where", "when", "why", and "how" follow the same rule.

Why People Hesitate

"Who" often sits right next to small words that stay lowercase, as in "The Man Who Knew Too Much," so it can look like part of the connecting glue. It is not. A relative pronoun stands in for a noun, and nouns and pronouns are always capitalized. Compare it with "that", which is also capitalized in titles, and with the conjunction "and," which is not.

"Who" in Sentence Case

APA reference lists, many news sites, and most UI text use sentence case instead of title case. There, only the first word and proper nouns get capitals, so "who" is lowercase unless it starts the title: "The woman who sold the moon." Pick one of the two styles for a whole set of headings rather than mixing them.

Quick Answers

Should "who" be capitalized in a title?

Yes. "Who" is a pronoun, and pronouns are capitalized in every title case style.

Is "who" capitalized in the middle of a title?

Yes. Position does not matter for pronouns: "The Man Who Knew Too Much."

Is "whom" capitalized in a title?

Yes, for the same reason: it is a pronoun. "For Whom the Bell Tolls" capitalizes it.