Type 0
Type 0 or Type O may refer to:
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Type 0
=Aircraft=
- Type 0 Carrier Fighter Mitsubishi A6M, a Japanese fighter aircraft
- Type 0 Observation Seaplane Mitsubishi F1M, a Japanese reconnaissance seaplane
- Type 0 Reconnaissance Seaplane Aichi E13A, a Japanese reconnaissance seaplane
- Type 0 Small Reconnaissance Seaplane Yokosuka E14Y, a Japanese submarine-based reconnaissance seaplane
- Type 0 Transport Showa/Nakajima L2D, a Japanese transport aircraft
=Watercraft=
- Type-0 heavy lift vessel Dockwise Vanguard, a semi-submersible heavy lift ship
=Entertainment=
- Final Fantasy Type-0, a video game
=Science=
- Glycogen storage disease type 0, a disease
- Type 0 civilization in the Kardashev scale of technological advancement
- Type-0 language or Recursively enumerable language in the Chomsky hierarchy of formal languages
- Type 0 string theory, a model of string theory
Type O
- Type O in the ABO blood group system
- an O-type star
- an O-type main-sequence star
- an O-type giant star
- a subdwarf O star
- the Handley Page Type O, a biplane
- an O-type asteroid