insist on + noun
Demand something strongly
Use on before a thing, action, or condition that someone demands.
The client insisted on a written agreement.
Insist on or insist upon?
Insist is usually followed by on or the more formal upon before a noun or -ing form. Insist can also be followed by that + clause.
Quick answer
Most common patterns with insist
Use insist on or insist upon for demands or strong opinions. Insist in is not standard after insist, and insist to is only possible before another verb in structures like insist someone do something, not with a preposition.
She insisted on a refund.
They insisted upon strict safety checks.
He insisted on speaking to the manager.
They insisted upon strict safety checks.
He insisted on speaking to the manager.
Choose the pattern by meaning
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
insist on + -ing
Continue to demand an action
Use on before an -ing form when talking about actions.
She insisted on paying for dinner.
insist upon + noun
Formal alternative to insist on
Upon is more formal but has the same meaning as on.
The contract insists upon full disclosure.
insist that + clause
State firmly that something is true or necessary
That clauses are common after insist, especially in formal English.
He insisted that he had never seen the file.
See the difference in context
The same subject can take different constructions because each sentence answers a different question.
Construction
Example
Meaning
insist on
They insisted on immediate action.
Standard and common for demands or strong preferences.
insist upon
She insisted upon complete honesty.
Standard but more formal than insist on.
insist in
They insisted in changing the plan.
Nonstandard after insist in modern English; use insist on.
insist to
He insisted to leave early.
Incorrect with this meaning; use insist on leaving or insist that he should leave.
Common mistakes
Some combinations appear in real text but do not mean what learners often assume.
Using in after insist
Insist normally takes on or upon, not in.
✕ She insisted in a meeting. ✓ She insisted on a meeting.Using to before a noun
Do not use insist to before a noun phrase.
✕ They insisted to better conditions. ✓ They insisted on better conditions.Forgetting the -ing form
After insist on, use an -ing verb form for actions.
✕ He insisted on stay. ✓ He insisted on staying.Quick practice
Choose the expression that matches the intended meaning.
1. The customer insisted ___ a full refund.
2. The professor insisted ___ strict citation rules.
3. She insisted ___ speaking to the director.
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Frequently asked questions
Is insist upon more formal than insist on?
Yes. Both are correct, but insist upon sounds more formal or literary.
Can I say insist in?
Not usually. Modern English normally uses insist on or insist upon.
What comes after insist when talking about actions?
Use insist on followed by an -ing form, such as insist on waiting.
Related preposition guides
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