their interest vs their interests

Both 'their interest' and 'their interests' are correct, but they are used in different contexts. 'Their interest' is used when referring to a singular shared interest or a specific topic. 'Their interests' refers to multiple interests or hobbies of a group of people.

Explained by Jennifer
Editor at TextRanch

Last updated: March 29, 2025 • 5604 views

This phrase is correct when referring to a singular shared interest or a specific topic.

"their interest"

Use 'their interest' when talking about a singular shared interest or a specific topic that a group of people have in common.

Examples:

Their interest in art led them to visit the museum together.
What is their interest in this project?
The team focused on their interest in environmental sustainability.

Show examples from the web [+]

Such a scheme may also enable the competent authorities to prioritise investment projects according to their interest for the region concerned.
The Council and the Commission are re-assessing their interest for the Community.
The amendment aims to give access to an internal review also to the members of the public where their interest is concerned.
However, neither of the importers put forward arguments according to which the imposition of anti-dumping duties would be against their interest.
Now their interest has faded, along with the macroeconomic numbers.
It is in their interest for you to survive.
Therefore, we must revive their interest in the political process.
It can thus be concluded that prolongation of measures is not in their interest.
In contrast, the Member States have recently confirmed their interest in concluding an ambitious and balanced agreement with Korea.
I am flattered by their interest but I am clearly escorting another lady.
I believe it would be in their interest to do so.
Harming us is no longer in their interest.
It is consistent with the general approach of the report but requests the members of the public to justify their interest in review.
The UK authorities note that BE's shareholders give up 97,5 % of their interest in BE's equity capital.
Indeed one would have thought it was in their interest to do so.
This puts a considerable damper on their interest and readiness to engage in the social dialogue.
It's in their interest to keep a low profile, especially after their identities are erased off the box.
They came out when it was in their interest to come out...
Following the notice of initiation, over thirty parties made themselves known and declared their interest in the proceeding.
- Parties requesting access to confidential information should submit detailed, substantiated requests that clearly demonstrate their interest in specific documents in terms of the right of defence.

Alternatives:

the interest they share
the common interest
the specific interest

This phrase is correct when referring to multiple interests or hobbies of a group of people.

"their interests"

Use 'their interests' when talking about the various hobbies or interests of a group of people.

Examples:

Their interests include photography, hiking, and cooking.
I'm curious about their interests outside of work.
The club caters to their diverse interests.

Show examples from the web [+]

They could thus defend their interests more forcefully.
Consumers should be provided with independent advice so that their interests are served best.
The Americans can defend their interests better if they are not tied down by multilateral agreements.
However, the managers may pool their interests through a vehicle company, so that it acts with a single voice and also to facilitate decision-making.
I know you will see to their interests.
It is a mistake to think that we are talking about their interests alone.
It's polite to ask guests about their interests.
Needless to say, religions will also lobby for their interests and their ideals.
So financial transparency is an important issue when people come to consider who is best able to defend their interests.
Representative democracy can function only when citizens communicate with their elected representatives and ask them to promote their interests.
The Single Market must be deepened and geared again towards citizens and their interests.
It is therefore understandable if some market participants are worried about how their interests are to be taken into account in the future.
In order for us to be able to uphold their interests, we must have the appropriate conditions for our work here.
If a Member State intends to amend Part II of this Annex, it undertakes to inform its partners and to take account of their interests.
Ad network providers use cookies and other devices to monitor the behaviour of individual users when they surf the Internet in order to catalogue their interests and build profiles.
Students can traverse this material in different ways, depending on their background, their skills or their interests.
Here, we should stress that their interests would be better looked after within the Doha framework rather than outwith it.
They're just protecting their interests.
But, equally important, workers organized themselves to defend their interests.
That requires laws and measures as a protective shield for their interests.

Alternatives:

the hobbies they have
the things they are interested in
the activities they enjoy

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their interest vs their interests

"their interest"

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