First stage or First Stage may refer to:
*
First Stage Children's Theater, a professional American children's theater based in Milwaukee, Wisconsin
*
First stage (rocketry)
A multistage rocket or step rocket is a launch vehicle that uses two or more rocket ''stages'', each of which contains its own engines and propellant. A ''tandem'' or ''serial'' stage is mounted on top of another stage; a ''parallel'' stage is ...
, the first stage of a multistage rocket
* the first
reading
Reading is the process of taking in the sense or meaning of symbols, often specifically those of a written language, by means of Visual perception, sight or Somatosensory system, touch.
For educators and researchers, reading is a multifacete ...
of a bill in the parliament of Ireland
* the high pressure regulator of a
diving regulator
A diving regulator or underwater diving regulator is a pressure regulator that controls the pressure of breathing gas for underwater diving. The most commonly recognised application is to reduce pressurized breathing gas to ambient pressure and ...
{{disambiguation