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English Capitalization Rules

Sep 2, 2025

Overview

This lecture covers eight essential rules for capitalization in English writing, focusing on when to use capital letters for different types of words.

Basic Capitalization Rules

  • Always capitalize the first word of a sentence.
  • Capitalize names and other proper nouns, such as people, cities, countries, companies, religions, and political parties.
  • Capitalize words like "Mom" and "Grandma" when used as a form of address.

Capitalization After Colons

  • Do not capitalize the first word after a colon, except when it is a proper noun or starts a complete sentence.

Capitalization in Quotes

  • Capitalize the first word of a complete-sentence quote.
  • Do not capitalize the first word of partial quotes.

Days, Months, and Holidays

  • Capitalize the names of days, months, and holidays.
  • Do not capitalize the names of seasons.

Title Capitalization

  • In titles, capitalize the first word, all nouns, all verbs, all adjectives, and all proper nouns.
  • Lowercase articles, conjunctions, and prepositions, unless some style guides require capitalization of conjunctions and prepositions longer than five letters.

Cities, Countries, Nationalities, and Languages

  • Capitalize the names of cities, countries, nationalities, and languages.

Historical Periods and Events

  • Capitalize names of specific time periods, eras, and historical events with proper names.
  • Do not capitalize centuries and the numbers before them.

Key Terms & Definitions

  • Proper noun — a specific name for a person, place, or thing that should be capitalized.
  • Form of address — a word like "Mom" or "Grandma" used when directly talking to someone, which should be capitalized.
  • Partial quote — a phrase or fragment from a source, not a full sentence.
  • Title — the name of a book, movie, or work, with specific capitalization rules.

Action Items / Next Steps

  • Review your writing for correct capitalization using these eight rules.
  • Visit grammarly.com for a writing tool to help check your grammar and capitalization.