Should You Capitalize Century?

Q. When should the word “century” be capitalized? ... Chicago style treats “century” like “day,” “month,” or “year”; we would lowercase it in all the contexts you cite.

Is early twentieth century capitalized?

However, do not capitalize the names of centuries or decades unless they are part of special names: the twentieth century.

Is 20th century a proper noun?

The word “century” in “20th century” should only be capitalized when used in a title or when referring to the “20th Century Fox” movie production company since that is a proper noun. Otherwise, you should lowercase the word “century” such as in this example: The 20th century was a whirlwind of technological change.