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What’s the Plural of Mouse?

Make no mouse-take, the plural of mouse is mice, when referring to the rodent. For a computer mouse, both computer mouses and computer mice works.

A wee mouse. Taken by Sandy Millar.
A wee mouse. Taken by Sandy Millar.

What’s the plural of “mouse”?

What’s the plural of mouse? Mouses? mices? mice? Make no mouse-take, and learn your correct English noun forms.

  • The plural of mouse is mice, when referring to the rodent.

  • To refer to a computer mouse, you can use mice or mouses. Both are correct to mention more than one computer mouse.

Sentence examples
singular We play cat and mouse for about ten miles.
pluralThe stores were overrun with rats and mice.

Some nouns switch their inner vowels from singular to plural.
Some nouns switch their inner vowels from singular to plural (like mouse and louse).

Modern English is made up of other, oftentimes ancient languages (such as Greek, PIE languages, Latin, and others.) When words of varied origins come together, incongruences abound. This is why English has so many peculiar plural noun forms. The wee mice is an example of one such irregular plural noun form that was brought down from the Germanic languages to showcase a plural noun. The mouse/mice showcase the effect of the I-mutation/I-umlaut.

Origin of the word “mouse” (& the I-mutation)

Mouse comes from the Middle English word mus, meaning ‘small rodent.’ Mouse and mice have Proto-Indo-European roots, and its plural form, mice, in particular showcases what’s known as the i-mutation, also called the i-umlaut. The i-umlaut or i-mutation might be familiar for students of Germanic linguistics and languages, but it’s meaning is often misunderstood. We know that the majority of English plurals are formed by adding an -s or -es at the end:

Regular plural nouns end in s/es.
Regular plural nouns chart. By Gflex on Canva

Middle English plural nouns also took an -s or -es, but the -s/-es suffix was not the only noun form to show more than one of something. Another form can be seen with the I-mutation. Despite the technical sounding name, the I-mutation is fairly straightforward. Instead of adding the conventional -s or -es, the I-mutation changes the vowels of the noun to indicate its plural form.


Similar to mouse, the singular of a louse is in fact lice. Lice are almost always referred to as a plural, which checks out because when we refer to lice, it’s implied that there will be more than one. Mouse, however, are oftentimes found on their own, so its singular form is used often, in addition to mice.

Examples of “mouse” in sentences

We’ve got a mouse in the house

The owl swooped down on the mouse.

“There’s a mouse in my room! It just ran under my bed!”

Examples of “mice” in sentences

My cat likes to catch mice.

Characteristically, mice are known to have a pointed snout, small rounded ears, a body-length scaly tail, and a high breeding rate. (Wikipedia: mice).

Mice are typically distinguished from rats by their size.

Cats, wild dogs, foxes, birds of prey, snakes and even certain kinds of arthropods have been known to prey heavily upon mice.

When the cat’s away, the mice will play.

Terms for male, female, and baby “mice”

  • Female are doe, male mice are bucks.
  • Baby mice are pinkys (because of their pink skin).

What do you call a group of “mice”?

Mice are “a nest”: “a nest of mice stood at the bottom of the staircase”. Mice in groups can also be a “mischief”, “group” or “horde“.

In review: plural of mouse

  1. Mouse is singular and refers to a single mouse.
  2. The plural of mouse is mice. The is the only plural of mouse.
  3. Mouse in groups are a nest, mischief, group or horde.

Read about other plural nouns


  1. Collective noun for mice
  2. Terms for male/female/baby mice
  3. Plural of animals quiz
  4. I-mutation

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