The difference between who vs. whom can seem surprisingly tricky. Both words refer to people, and they often appear in similar sentences. The real difference comes down to grammar: who usually acts as the subject, while whom usually functions as an object.
The confusion gets stronger because modern American English doesn’t always follow the traditional rule in everyday conversation. You may hear someone say, “Who did you call?” even though traditional grammar recommends “Whom did you call?” That doesn’t mean the rules have disappeared. It means English has evolved, especially in informal speech.
Quick Answer
Who is generally used when the person performs the action. Whom is generally used when the person receives the action or follows a preposition.
Compare these two sentences:
- Who called you? → He called you.
- Whom did you call? → You called him.
The easiest trick is the he/him test:
- If he, she, or they fits, use who.
- If him, her, or them fits, use whom.
For example:
Who opened the window?
The answer could be “She opened the window.” Therefore, who is correct.
Now consider:
Whom did you invite?
The answer could be “I invited her.” Therefore, whom is traditionally correct.
In everyday American English, however, who is very common even where traditional grammar calls for whom. For example, “Who did you invite?” sounds completely natural in casual conversation.
Comparison Overview
| Feature | Who | Whom |
| Main grammatical role | Subject | Object |
| Pronoun equivalent | He, she, they | Him, her, them |
| Typical use | Person performing an action | Person receiving an action |
| Example | Who called? | Whom did you call? |
| After a preposition | Less common in formal constructions | Common |
| Everyday American English | Very common | Less common |
| Formal writing | Standard | Often preferred when grammatically appropriate |
The simplest distinction is who = subject and whom = object.
Think of a sentence as a small action scene. The subject performs the action. The object receives it.
For example:
Maria called David.
Maria performs the action of calling. David receives the action.
Therefore:
Who called David?
Maria called David.
But:
Whom did Maria call?
Maria called David.
That basic relationship explains most cases of who vs. whom.
Main Differences Between Who vs. Whom
The central difference between who and whom is grammatical function. Who normally serves as the subject of a clause, while whom normally serves as an object.
Who Is the Subject Form
Who is used when the person performs the action described by the verb.
Consider:
Who broke the vase?
The person represented by who performed the action of breaking. The sentence could become:
He broke the vase.
Because he works as the replacement, who is appropriate.
More examples include:
- Who sent the package?
- Who ate the last cookie?
- Who knows the answer?
- Who designed this building?
- Who wants to come with us?
In each sentence, the person represented by who acts as the subject.
Whom Is the Object Form
Whom traditionally functions as an object.
An object doesn’t perform the main action. Instead, it receives the action or follows a preposition.
For example:
Whom did Sarah invite?
Sarah performs the action. The invited person receives that action.
You could rewrite the sentence as:
Sarah invited him.
Since him works here, traditional grammar calls for whom.
Other examples include:
- Whom did you meet?
- Whom did they choose?
- Whom are you helping?
- Whom did the teacher praise?
- Whom should we contact?
The grammatical pattern remains the same.
The He/Him Test Makes the Difference Clear
When you’re uncertain, forget the complicated terminology for a moment.
Try replacing who or whom with he or him.
If he works, choose who.
If him works, choose whom.
For example:
Who/Whom is waiting outside?
Try the alternatives:
He is waiting outside.
That works naturally. “Him is waiting outside” doesn’t.
Therefore:
Who is waiting outside?
Now try:
Who/Whom did you see?
The answer might be:
I saw him.
Therefore:
Whom did you see?
This test also works with other pronoun pairs:
| Subject | Object |
| I | me |
| He | him |
| She | her |
| We | us |
| They | them |
For who vs. whom, the most useful comparison is usually he vs. him or they vs. them.
Who vs. Whom in Questions
Questions create many of the most common who vs. whom problems.
The key isn’t whether the sentence is a question. The key is the grammatical role of the pronoun.
Use Who When It Performs the Action
Consider:
Who wrote the report?
The unknown person performed the action of writing.
The answer might be:
James wrote the report.
Therefore, who is correct.
More examples:
Who called the office?
Who made this decision?
Who left the lights on?
Who wants another cup of coffee?
Each question asks about the person performing the action.
Use Whom When It Receives the Action
Now look at:
Whom did the manager hire?
The manager performed the action of hiring. The unknown person received that action.
You could answer:
The manager hired him.
That makes whom the traditional grammatical choice.
Other examples include:
Whom did you invite to dinner?
Whom did the committee select?
Whom are you looking for?
Whom did she interview?
However, there’s an important wrinkle. In modern American English, speakers frequently use who in these sentences:
Who did you invite to dinner?
Who did the committee select?
These forms are extremely common in everyday conversation.
Who vs. Whom After Prepositions
Prepositions provide one of the clearest traditional uses of whom.
Common prepositions include:
- to
- for
- with
- by
- from
- about
- against
- among
When the pronoun directly follows a preposition, traditional grammar generally uses whom.
For example:
To whom did you speak?
With whom are you traveling?
For whom was the package intended?
By whom was the decision made?
These constructions are grammatically standard and often sound formal.
Preposition Placement Changes the Tone
English can place a preposition at the end of a sentence. This often sounds more natural in conversation.
Compare:
To whom did you speak?
with:
Who did you speak to?
The first version sounds formal. The second sounds conversational.
Likewise:
With whom are you going?
versus:
Who are you going with?
Both communicate the same basic idea.
The difference is largely one of grammatical tradition and register. Formal writing may favor whom, while everyday American speech strongly favors who.
Who vs. Whom in Relative Clauses
Relative clauses create another important distinction.
Compare:
The woman who called me is my neighbor.
Here, who performs the action of calling.
Now consider:
The woman whom I called is my neighbor.
This time, I perform the action. The woman receives it.
The structure becomes easier when you identify the verb’s subject.
Who as the Subject of a Relative Clause
Consider:
I met a student who won the scholarship.
Who won the scholarship?
The student did.
Therefore, who is the subject of won.
Another example:
The employee who manages the department is on vacation.
The employee manages the department. That makes who the subject.
Read More: Aluminum vs. Aluminium: Which Spelling Is Correct?
Whom as the Object of a Relative Clause
Now look at:
The student whom I helped passed the exam.
Who performed the helping?
I did.
Who received the help?
The student did.
Therefore, traditional grammar uses whom.
However, English often drops the relative pronoun when it functions as an object:
The student I helped passed the exam.
This version is completely natural.
That’s one reason whom appears less frequently in modern English than older grammar books might suggest.
When Whom Can Be Omitted
Object relative pronouns can often disappear without changing the meaning.
Compare:
The person whom I contacted replied quickly.
and:
The person I contacted replied quickly.
Both sentences work.
The second sounds more natural in ordinary conversation.
However, you can’t remove who when it functions as the subject:
The person who contacted me replied quickly.
You can’t normally turn that into:
The person contacted me replied quickly.
That changes the sentence’s structure and meaning.
The distinction gives you a useful clue:
- Subject relative pronoun: usually cannot be omitted.
- Object relative pronoun: can often be omitted.
Who vs. Whom in Embedded Questions
An embedded question contains a question inside another sentence.
For example:
I don’t know who called.
Here, who performs the action of calling.
Compare:
I don’t know whom she called.
Here, she performs the action. The unknown person receives it.
This distinction remains important even though the overall sentence isn’t written as a direct question.
Consider these examples:
- Can you tell me who is responsible?
- Do you know whom they hired?
- I wonder who sent the message.
- She asked whom we invited.
- Nobody knows who made the decision.
The same subject-object rule continues to operate inside the embedded clause.
Who vs. Whom in Compound Constructions
Sentences with two or more people can make the choice harder.
Consider:
Whom did Sarah invite?
Now add another person:
Whom did Sarah and David invite?
The pronoun remains an object because Sarah and David performed the action.
A useful technique is to temporarily remove the extra name.
Instead of:
Sarah and David invited whom?
Think:
David invited whom?
The answer is:
David invited him.
Therefore, whom fits the traditional rule.
Compound constructions can also create separate pronoun problems. For example:
The award was given to Sarah and me.
Not:
The award was given to Sarah and I.
The object form me follows the preposition to.
This is related to the same larger principle: pronoun forms change according to grammatical role.
Who vs. Whom in Modern American English
Traditional grammar gives who and whom distinct grammatical jobs. Modern American English, however, often doesn’t maintain that distinction in ordinary conversation.
That’s especially noticeable when whom appears in a question.
Traditional:
Whom did you call?
Common conversational English:
Who did you call?
The second version is extremely widespread.
This doesn’t mean whom has become meaningless. It remains part of standard English and appears naturally in certain formal constructions.
Why Who Is Becoming More Common
Several factors contribute to the decline of whom in everyday use.
First, who is simpler. It works in more conversational structures without forcing speakers to stop and analyze the sentence.
Second, English tends to favor forms that are easy to use in rapid speech.
Third, many speakers naturally avoid constructions that feel formal or stiff.
For example:
Who are you going with?
sounds perfectly normal in conversation.
With whom are you going?
is grammatically traditional but has a more formal flavor.
Neither sentence creates confusion about the intended meaning.
When Can You Use Who Instead of Whom?
In informal American English, who often replaces whom, especially when the pronoun follows a verb or appears in a question.
Common examples include:
Who did you call?
Who did she invite?
Who are you talking to?
Who did they hire?
These constructions are common enough that using who won’t usually cause confusion.
Still, context matters.
If you’re writing a formal report, academic paper, business document, or carefully edited publication, whom may be preferable when it clearly functions as an object.
The goal isn’t to force formal grammar into every conversation. Good writing also considers audience, tone, and context.
FAQs:
Is whom still grammatically correct?
Yes. Whom remains a standard English pronoun. It continues to appear in formal writing, after prepositions, and in traditional grammatical constructions.
Is it who or whom did you call?
Under traditional grammar, whom did you call? is correct because the pronoun functions as the object of call.
In everyday American English, who did you call? is extremely common and widely accepted in informal usage.
Can who replace whom?
In many conversational contexts, yes. Modern American English frequently uses who instead of whom, particularly in questions such as “Who did you invite?”
When should you use whom?
Use whom when it functions as an object, especially in formal writing and directly after a preposition.
For example:
To whom did you send the letter?
Is whom too formal for everyday conversation?
It can sound formal in many ordinary conversations. That’s why most speakers naturally say “Who did you talk to?” rather than “With whom did you speak?”
Conclusion:
The difference between who vs. whom becomes much easier once you stop treating it as a matter of memorization. The basic rule is simple: who traditionally functions as a subject, while whom functions as an object. When you’re unsure, use the he/him test. If you can replace the word with he, she, or they, choose who. If him, her, or them fits, choose whom.
