Title case orheadline case is a style ofcapitalization used for rendering thetitles of published works or works of art inEnglish. When using title case, all words are capitalized, except for minor words (typicallyarticles, shortprepositions, and someconjunctions) that are not the first or last word of the title. There are different rules for which words are major, hence capitalized.As an example, aheadline might be written like this: "The Quick Brown Fox Jumps over the Lazy Dog".

The rules of title case are not universally standardized. The standardization is only at the level of house styles and individualstyle guides. Most English style guides agree that the first and last words should always be capitalized, whereas articles, shortprepositions, and someconjunctions should not be. Other rules about the capitalization vary.^[1]

Intext processing, title case usually involves the capitalization of all words irrespective of theirpart of speech. This simplified variant of title case is also known asstart case orinitial caps.

According to theAssociated Press Stylebook (2020 edition, 55th edition), the following rules should be applied:^[2]

• Capitalize the principal words.
• Capitalize prepositions and conjunctions of four letters or more.
• Lowercase the articlesthe,a, andan.
• Capitalize the first and last words (overrides the rules above).
• Capitalize the "to" in infinitives (e.g., I Want To Play Guitar).^[3]

According toThe Chicago Manual of Style (15th edition), the following rules should be applied:^[4]

• Always capitalize "major" words (nouns, pronouns, verbs, adjectives, adverbs, and some conjunctions).
• Lowercase the conjunctionsand,but,for,or, andnor.
• Lowercase the articlesthe,a, andan.
• Lowercaseprepositions, regardless of length, except when they are stressed, are used adverbially or adjectivally, or are used as conjunctions.
• Lowercase the wordsto andas.
• Lowercase the second part ofLatin species names.
• Lowercase the second word after a hyphenated prefix (e.g., Mid-, Anti-, Super-, etc.) in compound modifiers (e.g., Mid-year, Anti-hero, etc.).^[5]
• Always capitalize the first and last words of titles and subtitles (overrides the rules above).

Since the 18th edition (2024), prepositions of more than four letters are capitalized.^[6]

According to the 9th edition of theModern Language Association Handbook, the following title capitalization rules should be applied:^[7]

• Capitalize the first word of the title/heading and of any subtitle/subheading.
• Capitalize all major words (nouns, verbs including phrasal verbs such as "play with", adjectives, adverbs, and pronouns) in the title/heading, including the second part of hyphenated major words (e.g., Self-Report not Self-report).
• Lowercase the second word after a hyphenated prefix (e.g., Mid-, Anti-, Super-, etc.) in compound modifiers (e.g., Mid-year, Anti-hero, etc.).
• Do not capitalize articles, prepositions (regardless of length), and coordinating conjunctions.
• Do not capitalize "to" in infinitives (e.g., I Want to Play Guitar).

According to the 7th edition of thePublication Manual of the American Psychological Association, the following title capitalization rules should be applied:^[7]

• Capitalize the first word of the title/heading and of any subtitle/subheading
• Capitalize all major words (nouns, verbs including phrasal verbs such as "play with", adjectives, adverbs, and pronouns) in the title/heading, including the second part of hyphenated major words (e.g., Self-Report not Self-report)
• Capitalize all words of four letters or more.
• Lowercase the second word after a hyphenated prefix (e.g., Mid-, Anti-, Super-, etc.) in compound modifiers (e.g., Mid-year, Anti-hero, etc.).

According to the 11th edition of theAmerican Medical Association (AMA) Manual of Style, the following title capitalization rules should be applied:^[7]

• Capitalize the first and the last word of titles and subtitles.
• Capitalize nouns, pronouns, adjectives, verbs (including phrasal verbs such as "play with"), adverbs, and subordinate conjunctions (major words).
• Lowercase articles (a, an, the),coordinating conjunctions, andprepositions of three letters or fewer.
• Lowercase "to" in infinitives.
• Lowercase the second word in a hyphenated compound when it is a prefix or suffix (e.g., "Anti-itch", "World-wide") or part of a single word.
• Capitalize the second word in a hyphenated compound if both words are equal and not suffixes or prefixes (e.g., "Cost-Benefit")
• Capitalize the first non-Greek letter after a lowercase Greek letter (e.g., "ω-Bromohexanoic")
• Lowercase the first non-Greek letter after a capital Greek letter (e.g., "Δ-9-tetrahydrocannabinol")
• Capitalize thegenus but not thespecies epithet.

According to the 21st edition ofThe Bluebook, used for legal citations, the following title capitalization rules should be applied:^[7]

• Capitalize the first and the last word.
• Capitalize nouns, pronouns, adjectives, verbs (including phrasal verbs such as "play with"), adverbs, and subordinate conjunctions.
• Lowercase articles (a, an, the),coordinating conjunctions, andprepositions of four letters or fewer.
• Lowercase "to" ininfinitives (though not defined in the stylebook).

The use of title case or sentence case in the references of scholarly publications is determined by the used citation style and can differ from the usage in title or headings. For example,APA Style uses sentence case for the title of the cited work in the list of references, but it uses title case for the title of the current publication (or for the title of a publication if it is mentioned in the text instead). Moreover, it uses title case for the title ofperiodicals even in the references.^[8] Other citation styles likeChicago Manual of Style are using title case also for the title of cited works in the list of references.^[9]

Wikifunctions hasa title case function.

• Sentence case
• Truecasing

• Typography
• Capitalization

• Articles with short description
• Short description is different from Wikidata