Who and whom both refer to people, but they have different grammatical roles.
The basic distinction is simple: who is traditionally used as the subject of a clause, while whom is used as the object of a verb or preposition.
Compare:
- Who called you?
- Whom did you call?
In the first sentence, who performs the action. In the second, whom receives the action.
Modern American English adds an important detail. In everyday speech, many people use who where traditional grammar would use whom. Whom remains useful, especially in formal writing and after a preposition.
Quick Answer
Use who when the person is the subject of the clause.
Who sent the email?
Use whom when the person is the object of a verb or preposition, especially in formal writing.
Whom did you invite?
To whom should I send the form?
A quick test is to replace the word with he/she/they or him/her/them.
- If he, she, or they fits, choose who.
- If him, her, or them fits, choose whom.
For example:
Who called?
Answer: She called.
So who is correct.
Whom did you call?
Answer: I called her.
So whom follows the traditional grammatical pattern.
Why People Confuse Them
The confusion happens because both words can ask about the same person.
For example:
Who called the manager?
and:
Whom did the manager call?
The first question asks for the person doing the action. The second asks for the person receiving the action.
Word order can make this harder. In a question such as “Whom did you invite?”, whom appears before the verb even though it is the object. The sentence becomes clearer when you turn it into a statement:
You invited him.
Because him is an object, the traditional form is whom.
Key Differences At A Glance
| Feature | Who | Whom |
|---|---|---|
| Main role | Subject | Object |
| Similar pronouns | he, she, they | him, her, them |
| Typical example | Who called? | Whom did you call? |
| After a preposition | Common in informal speech when the preposition moves to the end | Common in formal constructions |
| Everyday American English | Very common | Less common |
| Formal writing | Standard | Often preferred when clearly required |
The important point is that who and whom are not different in basic meaning. The difference is mainly grammatical role and, in modern usage, formality.
Meaning and Usage Difference
Who refers to a person or people and normally functions as the subject of a clause.
Who broke the window?
Here, who is the person who performed the action.
It can also introduce a relative clause:
The employee who answered the phone was helpful.
The employee is the subject of answered, so who is appropriate.
Whom refers to a person or people functioning as an object.
Whom did the committee select?
The committee performed the selecting. The person selected is the object.
The same distinction appears in relative clauses:
The candidate whom we interviewed was experienced.
Here, we is the subject of interviewed. The candidate receives the action, so whom fits the traditional formal pattern.
Whom is also commonly used after a preposition:
To whom should I address this letter?
With whom are you working?
In everyday American English, these may become:
Who should I address this letter to?
Who are you working with?
The second versions are common and conversational.
Tone, Context, and Formality
Who is the normal choice in most everyday conversations.
Who are you going with?
Who did you meet at the conference?
These sentences sound natural in ordinary American conversation.
Whom has a more formal or traditional tone.
With whom did you attend the conference?
To whom should I send the application?
This does not make whom outdated. It remains part of standard English and is especially useful in formal writing and constructions with a preposition.
There are also established expressions in which whom is very familiar:
To whom it may concern
With whom
For whom
Using whom simply because it sounds more formal can cause mistakes, however. For example:
Whom is calling? ❌
The correct form is:
Who is calling? ✅
The person calling is the subject of is calling.
Which One Should You Use?
Use who when the person is performing the action or functioning as the subject.
Who made this decision?
The person who called left a message.
Use whom when the person is the object and the formal object form is appropriate.
Whom did you invite?
The person whom I hired starts Monday.
After a preposition in formal writing, whom is often the natural choice:
To whom should I send the invoice?
For casual conversation, the version with who is usually more natural:
Who should I send the invoice to?
The choice therefore depends not only on grammatical role but also on the level of formality you want.
When One Choice Sounds Wrong
Some uses are clearly wrong under the traditional subject/object distinction.
Whom is coming to dinner? ❌
Who is coming to dinner? ✅
The missing person is the subject of is coming.
Another common error is:
The woman whom called me was friendly. ❌
The woman is the person who performed the calling.
The woman who called me was friendly. ✅
By contrast:
The woman whom I called was friendly. ✅
Here, I performed the calling, while the woman received the action.
A useful lesson is to look at the role of the pronoun inside its own clause, not simply at its position in the whole sentence.
Common Mistakes (and Quick Fixes)
Mistake: Whom is at the door?
Fix: Who is at the door?
Who is the subject.
Mistake: Who did you invite?
Traditional formal fix: Whom did you invite?
In everyday American English, the first version is extremely common. The second follows the traditional object form and is more formal.
Mistake: The man whom helped us was kind.
Fix: The man who helped us was kind.
The man is the subject of helped.
Mistake: To who should I send this?
Formal fix: To whom should I send this?
Because whom follows the preposition to, it is the traditional formal choice.
Mistake: Whom are you?
Fix: Who are you?
The question asks for the identity of the subject, not an object.
Everyday Examples
| Context | Best Choice | Why |
|---|---|---|
| Asking who performed an action | Who | The person is the subject |
| Asking who received an action in formal writing | Whom | The person is the object |
| Casual question with a final preposition | Who | Natural modern American usage |
| Formal question beginning with a preposition | Whom | Traditional object form |
| Relative clause where the person acts | Who | The person is the subject |
| Relative clause where the person receives the action | Whom | The person is the object |
Consider these pairs:
Who called the office?
She called the office.
Whom did the office call?
The office called her.
Who works with you?
He works with me.
With whom do you work?
I work with him.
The teacher who helped me was patient.
The teacher whom I thanked smiled.
The subject/object relationship is what determines the traditional choice.
Dictionary-Style Word Details
Verb
- Who: Not a verb in standard US English. It is primarily a pronoun and can function as an interrogative or relative pronoun.
- Whom: Not a verb in standard US English. It is an objective form of the pronoun who.
Noun
- Who: Not commonly used as a noun in standard US English. It functions primarily as a pronoun.
- Whom: Not commonly used as a noun in standard US English. It functions as an objective pronoun.
Synonyms
- Who: No exact one-word synonym fits every use. Closest plain alternatives can include which person or what person, depending on the sentence.
- Whom: No exact one-word synonym replaces it in every grammatical structure. Which person can serve as a plain-language alternative in some questions.
Neither word has a direct grammatical antonym. Their difference is based on grammatical case and sentence role, not opposite meaning.
Example Sentences
Who:
- Who left the package at the front desk?
- Do you know who is leading the meeting?
- She is the neighbor who helped us.
- Who wants to order pizza?
Whom:
- Whom did you contact about the problem?
- To whom should I send the completed form?
- The client whom we interviewed accepted the proposal.
- With whom did you discuss the schedule?
In casual American English, many speakers would use who in several of the whom examples.
Word History
Who comes from Old English hwā, an interrogative pronoun referring to a person.
Whom comes from Old English hwām, an objective or dative form related to who.
The modern distinction between who and whom reflects this older grammatical case difference. Modern English has reduced many such case distinctions, which helps explain why whom is less common in everyday speech.
Phrases Containing
Who:
- who is
- who are
- who called
- the person who
- people who
Whom:
- to whom
- with whom
- for whom
- by whom
- whom I met
- to whom it may concern
These patterns are especially useful because whom remains common in formal expressions and after prepositions.
FAQs
What is the difference between who and whom?
Who is used as the subject of a sentence or clause, while whom is used as the object. A simple test is to replace the word with he/she or him/her: he/she → who, him/her → whom.
Is it who or whom after a preposition?
Traditionally, whom is used after a preposition. For example, “To whom did you speak?” However, in everyday American English, it is very common to move the preposition and use who, as in “Who did you speak to?”
Is who or whom more common in everyday English?
Who is much more common in everyday conversation and informal writing. Whom tends to appear in formal, traditional, or carefully edited English.
How can I easily remember when to use who and whom?
Use the he/him test. If he fits, use who; if him fits, use whom.
- Who called you? → He called you.
- Whom did you call? → I called him.
Is “Who did you invite?” grammatically correct?
Yes. “Who did you invite?” is standard and natural in modern American English. Although traditional grammar may prefer “Whom did you invite?”, everyday English commonly uses who in this position.
Is “Whom did you invite?” still correct?
Yes. “Whom did you invite?” is grammatically correct, especially in formal writing or situations where maintaining the traditional distinction is appropriate.
Should I use who or whom in formal writing?
Use whom when it clearly functions as the object and the formal style calls for the traditional distinction. However, who is also widely accepted in many formal contexts, particularly when whom sounds unnatural or overly formal.
Which is correct: “Who are you talking to?” or “To whom are you talking?”
Both are grammatically acceptable. “Who are you talking to?” sounds natural in everyday American English, while “To whom are you talking?” has a more formal tone.
Can whom be the subject of a sentence?
No. In traditional grammar, whom functions as an object, not a subject. The subject form is who.
Why does “whom” sometimes sound awkward?
English usage has changed over time, and who has increasingly replaced whom in everyday speech. As a result, sentences using whom can sound formal or stiff even when they are grammatically correct.
Conclusion
Who and whom both refer to people, but their traditional grammatical roles differ.
Use who for a subject:
Who called you?
Use whom for an object, especially in formal writing:
Whom did you call?
The easiest test is to substitute he/she/they or him/her/them. The first group points to who; the second points to whom.
At the same time, modern American English frequently uses who where traditional grammar would use whom, especially in conversation and informal writing. Whom remains useful when a formal tone is appropriate and in constructions such as “to whom it may concern.”
The key is to understand both the grammatical role and the level of formality before choosing between them.
