01

01 may refer to:
* The year 2001, or any year ending with 01
* The month of January
* The number 1
* Zero One also known as "Machine City", a city-state from the "Matrix" saga
* Kolmogorov's zero-one law, a law of probability theory
* Pro Wrestling ZERO1-MAX, a wrestling promotion formerly known as Pro Wrestling ZERO-ONE
* BAR 01, a Formula One chassis
* 01, the former dialling code for Greater London
* "01" (album), the second album by Son of Dave
* The number of the French department Ain