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An indefinite pronoun is a pronoun which does not have a specific familiar referent. Indefinite pronouns are in contrast to definite pronouns.

Indefinite pronouns can represent either count nouns or noncount nouns. They often have related forms across these categories: universal (such as everyone, everything), assertive existential (such as somebody, something), elective existential (such as anyone, anything), and negative (such as nobody, nothing).^[1]

Many languages distinguish forms of indefinites used in affirmative contexts from those used in non-affirmative contexts. For instance, English "something" can be used only in affirmative contexts while "anything" is used otherwise.^[2]

Indefinite pronouns are associated with indefinite determiners of a similar or identical form (such as every, any, all, some). A pronoun can be thought of as replacing a noun phrase, while a determiner introduces a noun phrase and precedes any adjectives that modify the noun. Thus all is an indefinite determiner in "all good boys deserve favour" but a pronoun in "all are happy".

Table of English indefinite pronoun usage

Most indefinite pronouns correspond to discretely singular or plural usage. However, some of them can entail singularity in one context and plurality in another. Pronouns that commonly connote indefiniteness are indicated below, with examples as singular, plural, or singular/plural usage.

Table of indefinite pronouns

Number	Type	Negative	Universal	Assertive existential	Elective/Dubitative existential^[a]
Singular	Person	no one (also no-one), nobody – No one/Nobody thinks that you are mean.	everyone, everybody – Everyone/Everybody had a cup of coffee. one - One might see it that way. See also generic you.	someone, somebody – Someone/Somebody should fix that.	anyone, anybody – Anyone/Anybody can see this. whoever^[b] (nominative case), whomever [b][lower-alpha 2] (oblique case) – Whoever did this? Give this to whomever you wish. See also who-.
	Thing	nothing – Nothing is true. none - Spare change? Sorry, I have none.	everything – Everything is permitted. Universal distributive: each – From each according to his ability, to each according to his need.	something – Something makes me want to dance. this – This is good.	anything – Anything can happen if you just believe. whichever – Choose whichever is better. See also -ever.
	Place	nowhere – This student is going nowhere fast.	everywhere – Spiders are found everywhere on Earth.	somewhere – "Somewhere Over the Rainbow"	anywhere – I'm willing to go anywhere. wherever – Sit wherever you'd like.
	Time				when – When is the best time to come?
Dual		neither – In the end, neither was selected.			either – Either will do.
Plural			others – Others can worry about that.	some/most – Some of the biscuits were eaten but most were still there.
Singular or plural		none – None of those people is related to me.^[c]	all – All is lost; all are where they're supposed to be.	such – Such is life. what – What is that? What are they? who – Who is that? Who are they?	any – Any will do. whatever – Take whatever you like.

^ Elective existential pronouns are often used with negatives (I can't see anyone), while dubitative existential pronouns are used in questions when there is doubt as to the existence of the pronoun's assumed referent (Is anybody here a doctor?).
^ ^a ^b Archaic forms are whosoever, whomsoever.
^ Some traditional style guides^[who?] state that "none" should always be treated as singular, but the plural sense is well established and widely accepted.

List of quantifier pronouns

English has the following quantifier pronouns:

Uncountable (thus, with a singular verb form)

enough – Enough is enough.
little – Little is known about this period of history.
less – Less is known about this period of history.
much – Much was discussed at the meeting.
more (also countable, plural) – More is better.
most (also countable, plural) – Most was rotten. (Usually specified, such as in most of the food.)
plenty – Thanks, that's plenty.

Countable, singular

one – One has got through. (Often modified or specified, such as in a single one, one of them, etc.)

Countable, plural

several – Several were chosen.
few – Few were chosen.
fewer – Fewer are going to church these days.
many – Many were chosen.
more (also uncountable) – More were ignored. (Often specified, such as in more of us.)
most (also uncountable) – Most would agree.

Possessive forms

Some of the English indefinite pronouns above have possessive forms. These are made as for nouns, by adding 's or just an apostrophe following a plural -s (see English possessive).

The most commonly encountered possessive forms of the above pronouns are:

one's, as in "One should mind one's own business."
those derived from the singular indefinite pronouns ending in -one or -body: nobody's, someone's, etc. (Those ending -thing can also form possessives, such as nothing's, but these are less common.)
whoever's, as in "We used whoever's phone that is."
those derived from other and its variants: the other's, another's, and the plural others': "We should not take others' possessions."
either's, neither's

Most of these forms are identical to a form representing the pronoun plus -'s as a contraction of is or has. Hence someone's may also mean someone is or someone has, as well as serving as a possessive.