25 (twenty-five) is the natural number following 24 and preceding 26.
In mathematics
thumb|25 is a square.
It is a square number, being 5<sup>2</sup>. 25 is also the smallest square that is also a sum of two nonzero squares: <math>25 = 3^2 + 4^2</math>. In other words, the numbers 3, 4 and 5 form the smallest Pythagorean triple.
In religion
- In Ezekiel's vision of a new temple: The number twenty-five is of cardinal importance in Ezekiel's Temple Vision (in the Bible, Ezekiel chapters 40–48).
In sports
- In baseball, the number 25 is typically reserved for the best slugger on the team. Examples include Mark McGwire, Barry Bonds, Jim Thome, and Mark Teixeira.
In other fields
Twenty-five is:
- The number of years of marriage marked in a silver wedding anniversary.