Who or Whom: What's the Difference?

Many English learners hesitate when choosing between who and whom.

Since both words refer to people, it’s easy to assume they can always replace each other. However, they have different grammatical roles.

Who is used for the person performing an action, while whom refers to the person receiving the action.

Although modern spoken English often prefers who, whom is still important in formal writing, professional communication, and certain fixed expressions.

Once you understand one simple grammar rule, knowing which word to use becomes much easier.

Quick Answer

Both words are correct, but they are used differently.

Word	Correct?	Grammar Role
Who	✅ Yes	Subject
Whom	✅ Yes	Object

Quick rule

Use who when the person is doing the action.

Use whom when the person receives the action.

Examples

Who called you this morning?
Whom did you invite to the meeting?
Who wrote this article?
Whom should I contact for support?

What Is the Difference Between Who and Whom?

The difference is based on subject and object.

Use who for the subject.

The subject performs the action.

Examples:

Who won the match?
Who sent this email?
Who is waiting outside?
Who made this decision?

In each sentence, who is the person doing something.

Use whom for the object.

The object receives the action.

Examples:

Whom did you call?
Whom are they interviewing?
Whom should we thank?
With whom are you travelling?

Here, the action happens to the person.

What Does “Who” Mean?

Who is a subject pronoun used to ask about or identify the person performing an action.

It works like these pronouns:

He
She
They
We
I

Examples:

Who opened the window?
Who is leading today’s meeting?
Who wants another coffee?
Who answered the phone?

If the person is doing the action, who is the correct choice.

What Does “Whom” Mean?

Whom is an object pronoun.

It refers to the person affected by the action.

It works like these pronouns:

Him
Her
Them
Us
Me

Examples:

Whom did the teacher praise?
Whom are you waiting for?
To whom did you send the package?
Whom should we invite?

In every example, the action is directed toward someone.

The He or Him Test

The easiest way to choose between who and whom is the he/him test.

If he fits, use who.

Example:

Question:

Who is calling?

Answer:

He is calling.

Since he sounds correct, who is correct.

Another example:

Question:

Who finished the project?

Answer:

He finished the project.

Correct:

Who finished the project?

If him fits, use whom.

Example:

Question:

Whom did you meet?

Answer:

I met him.

Since him is correct, use whom.

Another example:

Question:

Whom should we invite?

Answer:

We should invite him.

Correct:

Whom should we invite?

This simple trick works in most situations and is much easier than memorizing grammar rules.

When to Use Who

Use who whenever the person performs the action.

Common situations include:

Asking questions

Examples:

Who is your manager?
Who won the award?
Who wrote this report?

Relative clauses

Examples:

The woman who helped me was very kind.
The student who answered first received extra marks.
The doctor who treated me was excellent.

Everyday conversation

Native speakers use who naturally in daily speech.

Examples:

Who is coming tonight?
Who left the lights on?
Who knows the answer?

When to Use Whom

Use whom when the person receives the action or follows a preposition.

After a verb

Examples:

Whom did they choose?
Whom are you calling?
Whom did she recommend?

After a preposition

This is where whom is still very common in formal English.

Examples:

To whom should I address the letter?
With whom are you working?
For whom was this gift purchased?
About whom were they speaking?

These structures appear frequently in:

Business emails
Legal documents
Academic writing
Formal letters

Who vs. Whom in Modern English

Modern English has become much less formal than it was in the past.

Because of this, many native speakers use who even when traditional grammar recommends whom.

For example, these sentences are common in everyday conversation:

Who did you invite?
Who are you talking to?
Who should I ask?

In formal writing, however, many editors still prefer:

Whom did you invite?
To whom are you talking?
Whom should I ask?

Both versions are understood, but whom sounds more formal and is often expected in professional or academic writing.

Real-Life Examples of Who and Whom

Understanding the grammar is easier when you see who and whom in everyday situations.

Everyday Conversation

In casual English, who is much more common than whom.

Examples:

Who is at the door?
Who sent you this message?
Who wants to join us for dinner?
Who called while I was away?

Although many grammar books recommend whom in some object positions, native speakers usually say:

Who did you invite?
Who are you talking to?

These sentences are natural in spoken English.

Formal Writing

Formal English follows traditional grammar more closely.

Examples:

Whom did the committee appoint?
To whom should I send my application?
With whom are you meeting tomorrow?
The candidate whom we interviewed accepted the offer.

Using whom correctly in formal writing makes your English sound more polished and professional.

Business Communication

Professional emails and official documents often use whom, especially after prepositions.

Examples:

To whom it may concern,
Whom should I contact regarding my order?
The manager selected the employee whom the team recommended.
With whom should we discuss the contract?

Academic Writing

Schools, universities, and research papers usually follow standard grammar rules.

Examples:

The professor praised the student who completed the project.
The researcher interviewed participants whom the committee selected.
The author who wrote the article received an award.
The scientist whom the university honored attended the ceremony.

Common Mistakes to Avoid

Using “Whom” as the Subject

This is the most common mistake.

Incorrect:

❌ Whom is speaking?

Correct:

✅ Who is speaking?

Since the person is performing the action, who is correct.

Using “Who” After a Preposition in Formal Writing

In formal English, whom is preferred after prepositions.

Less formal:

Who are you talking to?

More formal:

To whom are you talking?

Both are understandable, but the second version follows traditional grammar.

Thinking “Whom” Is Always More Correct

Some learners overuse whom because it sounds formal.

Incorrect:

❌ Whom won the race?

Correct:

✅ Who won the race?

Always decide based on the person’s role in the sentence, not on which word sounds more formal.

Who vs. Whom Comparison Table

Feature	Who	Whom
Correct English	✅ Yes	✅ Yes
Grammar role	Subject	Object
Replaces	He, She, They	Him, Her, Them
Common in everyday speech	✅ Yes	Less common
Common in formal writing	✅ Yes	✅ Yes
Used after prepositions	Sometimes	Usually

Tips to Remember the Difference

The easiest way to remember the rule is with the he/him test.

If the answer would be he, use who.

Example:

Who called you?

Answer:

He called me.

If the answer would be him, use whom.

Example:

Whom did you invite?

Answer:

I invited him.

Another simple trick:

Who = Subject
Whom = Object

If someone is doing the action, choose who.

If someone is receiving the action, choose whom.

Frequently Asked Questions

Is who or whom correct?

Both are correct. Who is used as the subject, while whom is used as the object of a verb or preposition.

Is “Who did you meet?” correct?

Yes. It is completely natural in modern spoken English.

In formal grammar, “Whom did you meet?” is considered more correct.

Why is whom used less often today?

Modern English has become more conversational. As a result, many native speakers use who in situations where older grammar rules recommended whom.

Can I always use who?

In casual conversations, who is acceptable in most situations.

For academic writing, legal documents, business communication, or formal letters, using whom correctly is still recommended.

Is “To whom it may concern” still correct?

Yes. It remains a standard opening for formal letters and professional emails.

Is “Who am I speaking to?” correct?

Yes. It is the natural form in everyday English.

A more formal version is:

To whom am I speaking?

Both are correct, but they fit different levels of formality.

Conclusion

Choosing between who and whom is much easier once you understand the difference between a subject and an object.

Use who when the person performs the action and whom when the person receives the action or follows a preposition.

While who is the preferred choice in everyday conversation, whom still has an important place in formal writing, business communication, and academic English.

If you’re ever unsure, remember the he/him test: if he fits, use who; if him fits, use whom.